Otherwise, if we have a lot of medium sized instances but the most popular communities are hosted on just a few huge instances, doesn’t that defeat the purpose of distributing load across many instances?
If that’s the case, how do we solve the cumbersome user experience of having to subscribe to the same community over and over again across a ton of medium instances?
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Yes, of course. But you don’t need to be part of every discussion to a subject. Just subscribe to one tech community you like (or as many as you want) and ignore the others.