More people on a dev team does not mean faster production, if anything it actually means slower production speeds given that you'll have more people to look after/manage (not always, but it can actually slow things down depending) -- I've seen game projects house more than 500 people through collaboration between multiple studios and it still took 3-5 years for the game to come out.

XIV actually patches at a quick pace given the fact the team is also working on a brand new client and server infrastructure, some MMOs that aren't working on a total overhaul patch a lot slower comparatively.