The current pacing would be fine if they:

a) Reorganized the schedule of the known things: Why we have to wait almost a year in to get a Field Operation and the relic weapon grind? The first half of the expansions is literally void of side stuff to do.

b) Find ways to add longevity and replayability to the content they release, especially normal modes.

c) It's not worth to invest resources making High End fights for 24 or more people. See what happened to the Chaotic mode, or even worse in the Forked Tower. The logistic nightmare that is to set up a competent group of that size is just not worth the trouble. I think 8-man is more than fine for High End fights... Or if you want to get creative, why not make a new party size of 12 people?