while i agree that quests need more diversity, i do believe that SE is already headed in that direction. if you treat faction quests as "quests", then you will find some that offers you group play and very tough looking mobs. i think you are asking epic sized quests from "side-quests" which are really just to offer some back story and lore into ffxiv. these quests are for people interested in the world/lore. and i dont know why you want more SP from sidequests when you already get a ton from leve-linking and group play. as of right now, sidequests are not made as an alternate to leveling up your character as it supports a different purpose

after level 20, main quest story starts at lv26, 30, 34, 38, 42, and 46. if you do the math, thats 3-5 levels in between each main story quest.

as for the translation of the game to the english language, i haven't come across anything remotely resembling bad english. i know LL has all nothing but pirate talk which can get really confusing a lot of times but the game itself is translated very accurately.

and saying that the maker of the game has no imagination is just wrong. they have created a whole new world that they are going to flesh out as time goes on.