Just spent the whole day dealing with GA4 (thanks Google!). None of my 50+ sites did anything above the basic page tracking, but on top of creating the new GA4 properties, I did have to update a bunch of very old ga.js tracking codes. Can't help but think Google could have made this whole process far less clunky.
Oh, and I also migrated the Universal Analytics for about 20 of my sites to their existing profiles on Fathom Analytics for good measure. At least I can still see everything in one place on Fathom! 🚀