Mario,
I'm not sure which BP you're referring to but thats a rather broad brush you're painting with and some incorrect assumptions underneath. No one ever said these were "constant" snapshots... once things are up and stable we typically delete the snapshots.
But any time I'm involved with a large, complex infrastructure project that has moving parts from multiple vendors I always, always ALWAYS have checkpoints/backups/snapshots along the way. Otherwise you're potentially wasting your time and the clients money! But also because my clients like to hear theres a safety net in place... just in case.