truth be told
To answer your question we might want to examine the gemara on 28a of brachos which says that Rabban Gamliel wouldn’t let anyone into the bais medrash if he was not “???? ?????”.
Perhaps the distinction is that the MY is talking about actually doing the mitzva instead of just outward appearance. The MY is saying that by doing it you will want to do it.
Yeshivish is outwardly appearing as someone who does Tzaddik stuff.