A lot of people only look at this kinda thing from there own perspectives and therefore dont consider what maybe other people need in the game.
it doesnt matter if you are a god at pvp and never take a singular hit in pvp, thats completely irrelevant to the whole topic.
if gapples were to be added they shouldnt cost emeralds
purely because if they are to combat the full dias who have mid control then whats the point
your saying gapples will slow the game however they will also speed it up in other ways, personally i find that i have to wait to heal before making my rushes around the map which slows me down and other players probably experience the same sorta thing
on the other hand in pvp, sure itll be longer but gapples dont work against the void so dont fight in the middle of islands