There's some speculation that the newer Pixel devices will be getting mainline (or close-enough-to-mainline) kernel support. So it should be relatively easy to work on a clean postmarketOS build for those, as opposed to relying on the AOSP-like LineageOS.

Lineage has never been very fast to release new Android versions. If Android 10 was out by now it would have been the fastest turnaround from AOSP release they've ever done.

I'm running LOS 17, which is Android 10 on a Sony XPeria Z3 Compact (!!) without issues (though it requires open g apps nano for GPS to work) :)

Had a similar issue with GPS on LineageOS 16. Setting the GPS mode to 'Device only' fixed it for me. My guess is the other settings have a hidden dependency on Google Play Services, causing GPS to silently stop working if Play services isn't available.

I don't think people use ROMs as much as they used to. Especially since mobiles are so fast nowadays that they don't get slow even if the ROM is bloated.

Also because many apps won't run on rooted phones. Funny how I can't use my bank's app but can do everything in the browser.

I get the security concern in that case, tbf, but not when it's some entertainment app.

Rooting with Magisk usually isn't enough to trigger SafetyNet failures (which is what most apps use to detect "rooting", among other things). I've been running rooted on my OnePlus 6 since day one without any app ever complaining, including google pay. Custom ROMs will fail SafetyNet typically, but there are ways around it if you want to keep hacking.

For entertainment apps it's mostly about thinking they're preventing piracy.