On top of everything that's been laid out here, I'd add that a lot of western Trot orgs have just gone stale. They have some outdated organizing methods and some end up clinging to leaders facing accusations of sexual assault or other grievances.

It is a shame because as others have said they are good at a few things, and in my area that includes getting bright-eyed young lefty students out to actions. They have a presence on campus that some of the more weathered community organizers don't.