Maybe domains registered more recently work differently, but my Google domains use a random user account generated by Google for eNom (the provider they were contracting with at the time). That makes each domain it's own virtual customer (I couldn't just login to eNom or Google see a list of all my domains). I need to log into Google Domains as a separate account for each domain, and then that takes me to GSuite which links to eNom.

Also, last I checked, unlocking a domain for transfer to another registrar required emailing Google/eNom. There's no interface for it. For a while the entire UI to choose to cancel a domain just disappeared as well.

I would not recommend Google Domains.