Linux systems are usually laid bare for people to tinker with, which for me is specially good if I see something I don’t like, be it software, UI or UX.
Plus, most PC’s I’ve seen from at least the past ~20 years can run Linux, so if I get my hands on a working PC, Linux becomes an easy choice.
Plus², Linux can be made very privacy friendly.
Iirc, there are unofficial ports of LineageOS for newer devices. Also, I’ve been using another system, ArrowOS, in its vanilla form, on a Redmi Note 10 Pro phone I have, and it’s working fine so far, so maybe an alternative for your case if you don’t find a decent phone compatible with LineageOS?