No one is forcing you to speed run, they will always exist, even if you don't like it. You just don't have to be a part of them if you don't want to. Now in 1.0 when Speed running was mandatory for gear....That's where the issues came up that led to 1 tank, 1 whm, and 6 blm parties, because BLM was the most powerful AOE Dps, and everything was AOE. Until you hit AV and then all those BLM's switched to MNK for the final boss because monks were kings of that fight. This did happen, and it was required to do so if you wanted darklight gear, because to get it you needed to beat the dungeon under a certain amount of time.

Making speed runs mandatory is a horrible game design choice and should NEVER be done again. However that will not prevent people from doing them, which is perfectly fine because you don't have to play that way.