> I submit the fact that is nearly 100% is effect, not cause.
Well, there's also the point that your shared state needs to be process-external as soon as you want to scale beyond a single process. (e.g. need to run on more than one server).
Yes - most sites/apps don't need that, but given that a lot of the web site framework and tooling is set up to make this relatively easy to do, it's nice to not have to rework your app fairly fundamentally once you hit that scaling wall.
Well, there's also the point that your shared state needs to be process-external as soon as you want to scale beyond a single process. (e.g. need to run on more than one server).
Yes - most sites/apps don't need that, but given that a lot of the web site framework and tooling is set up to make this relatively easy to do, it's nice to not have to rework your app fairly fundamentally once you hit that scaling wall.