The idea of what content is "normal" at this point is the wrong way to look at it. The content feed is so slow across all but the most active communities on the most active instances, that treating them as though they've already carved out their niches is just incorrect.

This can be that, there's no reason it can't - it's just the tiny number of posts you're seeing don't have the same representation you might be used to seeing on e.g. /r/mechanicalkeyboards.

If you're just going to lurk and have no interest in posting you might as well just go to instagram and search for keyboard related tags. The content you post doesn't even need to be your own boards, it could just be stuff you like.