Yeah. We have monkey brains, and overcoming intertia is hard.
I think the site could be better structured to address this, specifically by organizing communities into a “taxonomy,” so posts from niche interest automatically filter up into bigger subs. Thus, participation would feel easier/more enaging, and folks would have more focused and active niches to participate in.
Making that suggestion on the Lemmy/Piefed repos is on my messy todo list.