No problems here

I have just installed Lineage android 15 on my oneplus 5T and motorola edge 20 pro without any issues.

Both phones are running well and as expected

The inclusion of the reference photo of the lineage recovery is very deceptive.

with the meaningless heading: Challenges for power users and depreciated devices.

with the scary text:

Development and modding on Android often require a combination of trial and error and a significant amount of patience. Manually enabling individual permissions for every sideloaded app might be inconvenient, but it adds up over time. Apps blocked by the Play Integrity API have a wider impact, making it harder to modify apps and continue using apps their developers no longer support.

Accessibility, Notification listener, Device admin apps, Display over other apps, Usage access, Dialer, SMS, SMS runtime.

I can see why Google restricted those. I find it more difficult to see why this is raw deal for anyone.

(Except black hats who now need to enumerate each permission and explain to users why their app need e.g. SMS runtime access.)

Close to click bait?

As long as side loading is possible, I don't see were the onus of explicitly having to give a sideloaded app specific permissions is a major problem.