I can tell you my use case. I have a lot of systems which I'd like to use on a single computer AND at scale. That's sometimes even just for development work.

I can tell you my use case. I have a lot of systems which I'd like to use on a single computer AND at scale. That's sometimes even just for development work. A lot of these use a common API to a more complex distributed store, as well as to something simple like files on disk, in memory, or SQLite. I'm most cases, it's one user at a time, so performance doesn't matter, but simplicity does. It can also be for the project which has a 1 percent chance of going viral. Etc. But I find relatively few cases between truly small scale and large scale.