@ujm
Again, with the accusation that I “don’t like a Halacha”. Maybe I just disagree with your pshat?
“באקראי” is not a straightforward term. If we saw it by sukkah and eating before davening we would want to know what it means and what the gedarim are. I think discussion is good, not dogmatic assertions that this is what it means and how it is to be interpreted.
Rav Moshe seems to be allowing to learn secular studies during bein hasedroim which in most yeshivas is a set time every day. Again, does that mean if the questioner wanted to know if he went to a lecture on biology every day at 1pm to relax during bein hasederim, Rav Moshe would have assered? Maybe. I don’t know. Would he have still mattererd? Again, maybe.