If you would consider something immutable, I’ve been loving VanillaOS. Rockin’ it on a Thinkpad for the past couple of months and it’s pretty solid. I’m pretty sure it’s independent, and they are working on (basically) a v2 switching from Ubuntu to Debian as a base making it much more independent. Maybe wait until their v2 (Orchid) comes out because there are some good features the team says they’re incorporating that are kind of lacking in the current release.