GrapheneOS on a Pixel 7 is one of the best decisions I ever made. You can sandbox the shit out of all apps and granularly control the permissions in addition to outright cutting off network access to apps that would otherwise be doing background telemetry garbage all the time.
If you're terminally online and just can't imagine life without all the first party Google apps, you'll disagree with me. But otherwise it is a great decision. F-droid and Aurora Store are awesome. (You can still manually install and use stuff like the Google camera app, Maps and others. Just never sign in to first party G Apps, be careful with your permissions etc. and you'll retain 90% of the functionality while not having the privacy downsides.)
I've been using LineageOS+MicroG with very little google software (only maps) and it's been working great. Any reason I should switch to Graphene? I noticed the main dev seemed to have some disputes and interesting personality characteristics, so I was a bit hesitant to adopt. I also had an irrational "I wouldn't be surprised if 3 letter agencies are involved" vibe about Graphene, but nothing concrete.