My Coros Pace 2 will go 2+ weeks without a charge if I don't use it much. Don't think it's e-ink and I wouldn't really call it a smart watch. You can get texts and weather but when it syncs with the phone. It's more of a fitness watch.
You can always do a test run from a Linux live CD / USB with no commitment. So you can try Linux for as long as you want without disrupting you current environment.
Had a guy like that in college too. One that stood out the most is he played varsity basketball as a freshman in highschool standing right next to someone he went to highschool with. Guy gave him a weird look look and afterwards told us, I don't know what he's talking about he never played basketball in highschool at all. He was constantly telling pointless easy to prove false shit.
Another problem is people using LLM like it's some form of general ML.