Is volume mounting the hardest problem in cloud computing ?
All buzzwords till now is scammy in the sense that, it doesn't make any sense when you can't cache your data in your local file system.
It kind of is.
If you don't provide a mutable filesystem, you get a whole bunch of benefits:
Need to scale to handle more traffic? Start another instance and add it to the load balancer.
App crashes for any reason at all (including a hardware failure)? Fire up a fresh instance on another physical server and load balance there instead.
Want to provide zero-downtime deployments? Start a new instance running with the new code, switch the load balancer over to serving from that instead, then shut down the old instance.
Each of these becomes a LOT more complicated if you offer read-write volume support.