Sam: But there’s no defined “Yeshivish” community or organizations. The term is merely colloquial. The same is true about “Chareidi”. The organizations that people call yeshivish or chareidi don’t refer to themselves as that. OTOH, you have an official MO movement with MO organizations and institutions and rabbis who officially consider themselves MO. Those who are colloquially called Yeshivish (or Chareidi) mostly never referred to themselves as such. In America you can go to Yeshiva from Kindergarten through Kollel and you will most probably never hear “we are Chareidi”, and you may even never hear the term used at all.
What I’m trying to understand is if there are no “MO shittos” or minhagim why does anyone officially consider themselves to be MO or have established MO institutions?