So, I'm on a P7 with GOS, and truly it is a brilliant way to divest oneself from google services, alongside being probably the most secure third party ROM. I think, they're certainly very keen on it, and laudably competent, updates are around weekly, sometimes every couple of days, because there are some vulnerable (to state level actors etc.) users. It's been great, I have a primary profile that is google free and a secondary for google stuff that I want, and over time I find, at my own pace, FOSS things to move into my primary, so I don't need my secondary as much, until I didn't need it at all. It's great, and now I can move to any other ROM without google services and be (mostly, except for some bastard in real life requiring an app that I can't install in secondary on Lineage etc, at least last time I used it, which will come up) happy. Thankyou GOS. Also, being able to revoke network permissions on any random app (including google services) via OS is Gold.
That said, P7 has some issues, it runs hot (I recorded via termux), and if you live in a hot humid environ, don't expect longevity near the 5Yr security updates promised. Mine's spicy pillow at 16 months, enough to break the seal and accelerate degeneration. I live in a country with consumer protection for 24 months, so it's not so bad (I hope, batteries are special), but in the rest of the world it would suck. I do not want to replace my phone every year, assholes.
TLDR: Get a second hand Pixel (4-7), hence not giving money to google, replace the battery, install GOS. Learn, live, enjoy, at the end you will have learned to live free (if that's what you want).