The only real disadvantage is finding yourself annoyed by obvious absences in the standard libraries of every non-APL-family language you come across. "ugh why

The only real disadvantage is finding yourself annoyed by obvious absences in the standard libraries of every non-APL-family language you come across. "ugh why can't this sort() just give me a grade instead?" "why does this provide reduce(), but no scan?" "this would be so much cleaner if I had transpose, or even just laminate..."