The reason academics don’t like students “dropping out” of programs is that the students have already invested a lot of effort and don’t ultimately come out with a degree.
There is no such thing as an equivalent “dropping out” of yeshiva because yeshiva has no end date, no degree, nothing to signify a completion of studies (unless you count semicha but I am referring to kollel guys who got semicha along the way years ago).
This, of course, is because we don’t believe in such a thing as a completion of studies. Learning should be lifelong. That’s well and good. But just because a bachur leaves kollel to go work does not mean he is c”v not learning at all anymore.