The only issues I've seen from .dev is:
- It's owned by Google (opinions differ). Google owns a lot more TLDs than I thought...[0].
- Like .app, it requires TLS for web hosting (good for production, annoying for local work).
- Not all services that host DNS support it. For example, Cloudflare's registrar[1] didn't support .dev until August '23.
I don't believe the deprecation of Google Domains has any impact on the Google Registry side of things, but I could be wrong. I transferred my domain out of GD once my preferred registrar supported it.
[0] https://www.registry.google/
TLDs: meme, ing, app, day, new, soy, dev, dad, foo, mov, nexus, how, esq, rsvp, page, phd, prof, zip, boo, and みんな
[1] https://community.cloudflare.com/t/request-cloudflare-regist...