I've still got old accounts with photos etc on that I cannot move, and the only reason I moved from GAFYD is because of so much functionality being missing.
GAFYD https://lifehacker.com/what-does-google-apps-for-your-domain...
...and I cannot, unless they all have my domain.
By the way, you can sort-of "move" your photos by adding them to shared album and "saving to local" on the other side. But then, if the original account is removed, the photos are still removed (AFAIK).
I really do wish I hadn't moved my domain over to them - but my Google Calendar, email, and Google Play purchases are all in there.
You can't use family sharing on a Google Apps/G Suite/Workspace account at all, whether they share your domain or not.
With this restriction on Workspace accounts, I decided to just forego a subscription altogether until they get their act together.
Google is happy to drop you, mostly for an obnoxious up-sell. You're a statistic, and if they drive your business under, that's a statistic too.