G Suite says Enterprise but doesn't actually do it.
For years, you had to turn of 2fa enforcement for the whole org, or do janky hacks with special groups and policy exceptions for groups to onboard new employees because they hadn't gotten around to a first time login flow that had a mandatory 2fa enrollment; instead they'd just prompt for the 2fa code you couldn't have setup.
There's no way to merge two separate G Suite accounts, in case your company merges with another company. You're just supposed to setup new users in the new org and close the old org account. Even more fun to be had if you want to keep the same usernames (I can't imagine the collosal pain it would be if you also wanted google handling the email during that transititon).
Oh yeah: there's no way to stop people from trying to setup consumer google accounts on your corporate domain. Most of those are spammers or idiots that won't get confirmed, but some of them are employees doing things wrong, and can confirm them, but then you have things like two accounts with the same name that are different because one is a g suite (but you can't register the domain for two different organizations, because three accounts with the same name would be too much)