Honestly, it's very valuable to me too to have LineageOS on the Astro.
I my not run it right away, sticking with whatever PC ships on the Astro, but in time...
It doesn't have to be LineageOS per se, for a colleague I recently installed AOSPExtended on his phone, I really liked the look and feel of that one too.
But custom ROM support for a couple of years longer than manufacturers are typically supporting is worth a lot.
I have 2 old and not really used Galaxy S4 phones (used for other things, like alarm clocks) running LOS, and my backup phone is a OnePlus 3T which had no more official support since late 2019, it now also runs LOS with weekly updates.
Anyway, if I still use the Astro (well, getting ahead of myself) in a couple of years, surely by then running a custom ROM, I'll also happily dunk $5 in a tip jar every few months.