I prefer leader out(to the point that I usually hand-rewind my F4 and F5 to get it, and have my F6 set to do it), but my habit for a while has been to tear the leader off so that I know it's been exposed. This may be unecessary paranoia, but I still mostly have color film lab processed and the labs I use largely use minilab type machines that use a leader card to pull the film out of the cassette. With as difficult as a lot of cans are to open now(especially in a changing bag, which is what I'm using now), I've found that I largely prefer pulling out the trap to opening the can where possible. I have been told that leaving the leader out is less likely to get dirt and crud in the light trap that pulling the film in. Of course that's irrelevant if you pop the can and pull the film that way, but using a leader pick(as minilab machines will generally have to do) is yet another chance to get crud in the trap that's then there to scratch your film as it's pulled out. Maybe all that's a fairy tale or an exaggeration, but it's how I've been doing it for a while so I doubt my habits will change.
Granted with Kodak now moving a LOT of films to Estar, this has become quite a bit more difficult. The first roll of Ultramax I shot this caught me off guard, especially as I hadn't realized Kodak was moving so many films here(and my pocket knife came to the rescue). Most of the 35mm B&W films out there still seem to be on acetate(I know there are some exceptions, like a few of the Rollei offerings, and almost all 70mm film color and B&W is on polyester) so it's not a big deal. Even if I don't have a way to cut/tear the leader, just pulling on polyester will "distress" it enough that it's pretty obvious to me that I at least attempted to pull the leader off.
To the thread-I have a dozen mixed rolls of P3200 and Delta 3200 that I bought in 2018 or so out in the freezer, and after they inadvertently spent about a year stored out of the freezer I've just let them be because I wasn't sure if they would be useable. This thread makes me want to load one up and try it, albeit probably at ISO speed and not the box EI.