In a very rough way, it does tell you about those things. Yes, a half-ass print of a negative can tell you somethings about the negative, but so will...looking at the negative. If you aren't even going to enlarge or dodge-burn the print, you might as well just look at the negative.
No it will not. If you have no idea what a photographic paper needs, contrast wise, you have no idea if you are developing and exposing your film correctly. The contact sheet is a control, where you always expose it at the same contrast, the same everything, and every time you do this you perform a check against a constant. This constant is the paper, the paper developer, and what it is capable of at average contrast.
I don't; and neither do you. The printer chooses which tones go on the paper. Paper always has much more contrast and much less range than negatives for taking...it's foundational to the neg-pos process that the printer chooses which tones to print as midtones and which to discard on the toe or shoulder of the paper. If you print the negative straight, you are missing most of the negative information; that is why judging the merit of negatives by contact sheets is silly.
It is not silly. Take a step wedge and lay it next to your negatives, and you can tell with very precise accuracy how your film exposure and development is going. Short of actually printing your negatives or reading them with a densitometer, it is the best way possible you can judge a negative, unless you have a LOT of experience in judging them with the naked eye. But if you don't have a reference of what a good negative looks like, you could be all over the place. If the OP some day gets to printing in a darkroom, it would be important to have negatives that will work.
If a negative looks good on a contact sheet with white light, (using the same paper as you do when you print, in my case Ilford MGIV fiber), then it will look good enlarged at a similar contrast too. That is in fact how I keep my own film development and exposure in check, to make contact sheets. It ensures I have negatives that print with very little darkroom gymnastics at around Grade 1.5 to 3.5 and I still have plenty of leeway to lower or increase contrast for when I screw up.
If you call that silly, then I will call your methods sloppy and haphazard.
Negatives are not like memory cards where you have to download them before the image is visible. They are little photographs; notably viewable.
Contact sheets for proofing are great for filing because they are reflective and you don't need a light box. That is the extent of their utility.
You don't have to tell me what negatives are. I know perfectly well what they are. They either print well or they don't. They are an intermediary and is supposed to have the tonality in a print that you like and appreciate to base your work on. A contact sheet will tell you very quickly whether you were successful in generating such a negative or not.
Even though you don't always need a perfect negative, it's important to have some sort of standard to aim for. The print is the ultimate standard, of course, but I can tell you that after nearly two decades of doing this I still can't judge a negative properly, and whether it's going to print right or not. But when I make contact sheets it gives me two things:
1. It tells me exactly how I am doing with film exposure and development. If I'm drifting with either of them it will be blatantly obvious.
2. It gives me an idea of whether I'd like to print the negative or not.
That's not silly, it's being practical.