FWIW, the points against a ball head are spot on in my book. Get a geared head. Manfrotto makes an inexpensive one if you buy used. It's kind of a space hog and heavy, but a big step up from a ball head for a view camera (or any as far as I'm concerned).
I recently bought an Arca Swiss and love it. If the relative cost is an issue, there are other monorails. If cost is an issue, maybe its not the best choice. But if a monorail suits and a relatively compact one as well does, then push ahead without regret. Everyone has their prejudices, and if you feel you need this sort of thing... then do it or find a similar one. Linhof also makes a relatively small monorail and Sinar Norma. I think Toyo has some as well... though they may be equally rare. Arca isn't the only one... it's an oft recommended one, but not the only one. Perhaps because the F line is their most known product, their rep in this regard may be more widely appreciated than the others whose flagship products aren't their smallest stuff.
If you've going to wonder whether you'll push the limits and regret THAT decision, then don't do it. For my bit, I have no regret. I've made plenty of in-and-out camera mistakes in my time, but not this one. The cost is sufficient that it HAS to be a keeper.... but the lack of equipment on the market doesn't just attest to the fact that this is a small production item, but also that most folks keep them a lifetime. Rod Klukas says that they sell about 1 a month, so yes, that's small volume compared to digital cameras and probably better known brands like Linhof and others. Will the Arca F seem as light as you think it will be? No. Why? Because you'll add another lens to your bag and you're back to the same weight. Fact is you might even finally spring for a backpack big enough to carry the stuff you've put in separate bags... at least I did. And so I'm also carrying 6 film holders (thanks to Dan Stone).
I think the dirt and dust thing Drew mentions may be real, but I tend to baby my equipment. Haven't seen or heard of this as a problem. Maybe if you throw it in the mud or shoot in dust storms you'll have an issue if you don't wipe it down. But your tripod will have the same problem in some cases. I think Drew probably meant this more as a general caution - and its valid in that case, but to avoid the whole idea or precision and prefer a monorail with lots of slop in the mechanism isn't probably what he's recommending either. So would it be fair to suggest that I probably would have been equally happy with another monorail? Possibly. And did I spend more money than I had to? Definitely. But somethings you just go ahead and do and look ahead and not back. It was a good decision, and there are always "mightas and wouldas" in every one we make. Make the decision and move on. Weigh the factors, and pull the trigger.
Ultimately, your lens decisions, your supports (tripods) and lights, and the decisions that drive how you print will likely cost you a lot more. There's not really a cheap part to the process once you get past the film and paper, chems etc. I think if you're going to focus on film in a digital age, you'll spend what you feel is justifiable for the process you choose to make that happen. You can expect with most to sell used equipment at half or less of what you pay for it. With an Arca, maybe slightly more due to its perceived desirability and relative scarcity. Over what period of time does that differential make sense? Certainly in the years and decades... you have the option (whatever you choose) with this route that digital does not offer due to higher obsolescence and more rapid decay in resale. Look at rentals for a digital camera - or even digital lens! - and you'll see that none of the camera parts of the process are all that expensive to buy compared to rental costs. So there's always a logic you can use to justify what you want to do. Been there, done that.
In sum, the sooner you make a decision and start using the camera that fits your need, the longer your use will run, and the more worthwhile you'll find it. If ARCA is that pick, then maybe you need a slightly longer period of use (but probably less lengthy than some of the brand's detractors would have you suppose). Google Rod Klukas. He's a good dealer. There are others, but he'll work with you to help match your objectives to the most suitable of Arca's options. He also sells used equip when he has it - which is rarely.
I think the chief fair knock on Arca is that all parts tend to be expensive due to high precision machining, and small volume. These are two sides of the same coin. So while the modular nature of all Arca parts allow you to cobble together anything you want, any combination whatsoever, you may find that taking an F 4X5 Field and adding a bellows and rear frame/format to use it for 5X7 as well is more expensive than you'd think. So if actually applying the camera's modular aspects is something you plan on, then ARCA might become a gift that keeps on giving - to ARCA. Something to think about. Yes, you can do it but you have to do it carefully, and there's no package discount for the odds and ends needed to do it.
So that's my four cents. Doesn't differ materially from what others are posting, but simply the view of a user as opposed to others who made different decisions for their own reasons. Arca is a great line of cameras, but there are others that are fine, too. Make your own decision and don't regret it, and don't be afraid to call Rod and discuss ARCA or some of the other dealers to discuss their line-ups.