I'm in the process of moving my domains to Porkbun. Of course, I was leaning on the included mail forwards that Google provided, so that part has been fun.
Trying to remember why I registered with Google in the first place... I guess it was only that they had the .dev? Nothing really else there. Mail fwds over at porkbun no problem
Same for me. At the time I got my .dev's I'm pretty sure only Google Domains sold them. I moved to porkbun now as well.