Gsuite admin here. They do have recovery tools if user data in gmail or google drive etc gets accidental deleted - the user-accessible 'bin' being the simplest! But admins can recover that data from the last 30 days regardless, along with user accounts - presumably it's not actually gone from disk till after that. Beyond the 30 days though, they warn the data is likely gone for good.
To delete the entire gsuite account though, that's not a simple fat-finger error, that's a full on failure to read what's in front of you, and doing it anyway including clicking through the warnings. I've never actually done that particular step, but the admin interface is clear when what you're doing will cause permanent data loss, including disabling certain services, and has 'are you sure?' confirmations. I'm not surprised that deleting the whole shebang meant google couldn't just turn it back on and have all the data linked back with user accounts etc. there's a huge amount of different services linked together under the 'gsuite' brand, I'm sure the bits were still there somewhere, but it's a bit like deleting the partition table on a disk, or formatting your last AD server, and expecting the restore to be simple without your own backups.
As a long-time sysadmin, with great power comes great responsibility etc...
And yes, we back up important data via external backups. There's a bunch of cloud-to-cloud backup services, as well as API access to download things, and on the individual level 'google takeout' lets you back up literally everything - including a bunch of stuff you didn't even know google had, though a lot of the data analytics/advertising stuff is turned off for gsuite business/education customers.