Crystal tower is the fastest run available, outside syrcus tower. You can dps the crap out of the boss and ignore 99% of mechanics outside the last boss. There's no point in adjusting a 24 man raid when it's old content. Unless they add further rewards like MSQ cutscene simulator for triple xp and 5x's tomestones (which isn't gonna happen), it's not worthwhile for the devs to go back and adjust old content from ages past.