Just installed it on my OP5T (dumpling). Still have root, passing device and basic integrity. Apps are snappy, brightness feels more balanced, and I just LOVE the use of screen real estate. Smaller fonts and icons make the screen feel huge
Dirty flashed over Lineage 20 with updated Gapps. Just make sure you unhide Magisk first or you'll have to re-root after.
No. Not usually. Some work and some don't. What would be useful is some os seem to have a sandbox. So everything works in it. Then you have the rest of the phone separate