Only having access to 4 emotes at a time out of such a large selection is terrible design, if pressing down on the d-pad or a designated keybind on keyboard instead brought up a radial menu while held down it would be possible to bind 8-12 additional emotes to a wheel that could be selected from with a thumbstick or mouse cursor, triggering the chosen emote when the button is released. Plenty of other multiplayer games that have emotes have been using systems like that for years, why is D2 still stuck in the dark ages?!