One REALLY super nice feature of PieFed is that the sidebar text is shown underneath EVERY single post. Lemmy does not do that, and especially some apps almost look like they are doing their best to outright hide that information for some reason, putting it many clicks away!?

Imagine seeing a post on All, and knowing what the exact and entire set of rules are, prior to posting (including a reply to a post, as you said a drive-by).

To be fair, someone does have to scroll down to see it. But at least it's right there on the same page, not some whole other page entirely and buried many clicks away besides (going back and forth to writing a message that way, checking specific acronyms in the sidebar area, can get really annoying that way! in those apps that do it that way I mean, while in a browser you basically would need to open up a new tab, one for the post and a separate one for the community).

At least this seems like it would help reduce such effects? Maybe? Alternately, these feeds are basically like meta-communities themselves, created (and maintained?) by a "moderator", so perhaps if someone did not want their community included (which seems to run counter to how many communities would want to increase rather than decrease their discoverability), they could write to the "mod" to ask that it be removed?

Alternately, perhaps communities themselves should have a "private" setting. Lemmy already has a "local-only" setting along those lines. I remember that Reddit has a bunch of opt-in features regarding discoverability, but all of this in both Lemmy and PieFed is extremely primitive in comparison. At least PieFed is moving quickly with adding new features, so for it even if not for Lemmy, there is a strong hope to see all of this that we are talking about!:-)