This was true maybe 8 years ago when all we had was buggy ceph drivers; but now the integration with the various cloud EBS-alikes is pretty good/seamless. VolumeSnapshots, WaitForFirstConsumer (so you're allocating in the right AZ as your STS comes up, etc etc).

It's really not all that bad anymore. I'll take going to any client and having roughly the same storage setup anyday over the hell that was the mix of enterprise sans we used to have to deal with.