Because the timing and correct execution of a long sequence of inputs is part of the "DPS challenge" of this kind of games. An excessive pruning would remove the challenge and with it the fun and the satisfaction. Think about the HEALERS, where at 90 you click stone for the whole fight + occasional aoe heal.
why do you need to click 1,1,1? it's easy to make the character do only autoattacks and remove the burden of press a button at all.
why do you need to move? We already have the code ready, the NPC of duty support. SE could make the character move for you.
why do you need a burst damage window?
and we can continue to demolish until we do nothing, just watch the AI playing the game for us.
is it extreme? Not really, we already have android/Ios game like this.
My opinion would be very different if we were talking about an action RPG game, like ff7 remake, but ff14... is not.