Great question! You only care about this if you care about cost utilization. If you don't care about cost then you will just statically pre-allocate the space

Great question! You only care about this if you care about cost utilization. If you don't care about cost then you will just statically pre-allocate the space on a host, waste the slack, and never overcommit. If you do care about cost then the pessimistic pre-allocation of space will look wasteful and you'll want something like this. The other aspect of your question is about how "many of us" are working at places with huge datacenters. If you count up all the folks at Amazon, Google, Microsoft, Facebook, and Apple how does that compare to the long tail of people operating smaller datacenters at smaller companies?