I’m not talking about smaller shuls (although shtieblech definitely have that issue) I’m talking about the main shuls for various very big Chassiduses. I guess I can be dan l’kaf zchus and assume that those people davened at earlier minyanim, but in most of the Rebbish shuls I’ve seen, you are guaranteed to find at least two rooms where there is a minyan or more sitting around eating and drinking while the main davening is going on.
It’s simply inconceivable that a Chassidus where thousands are davening at their Rebbe that there *aren’t* a few dozen who sit it out. Combine that with the openness that Rebbish shuls usually have, being more of a community center than a shul/beis medrash.