More people would be great, especially for niche communities.
I don’t see #2 as that big of a problem. Do we want people who won’t expend any effort to join? I guess everyone sees the line between accessible and “dumbed down” a little bit differently. I’m not saying #2 is great. I recognize it is an obstacle. But it’s also kind of the point of Lemmy…in the sense that this is not a monolithic corporate one-size-fits-all kind of endeavor. In a way, the obstacle also serves as a teaching moment, if you will, of how this thing even works.
Item 4 seems a bit chicken-and-egg to me. But my guess is, not being able to find those communities isn’t nearly as big of a problem as those communities not having any content / participants. I can see the argument that one causes the other, but I haven’t found it very challenging to find those empty places. It’s just not much fun to hang out there by yourself.