It's because they are a small team. The game blew up too fast. Now they are trying to juggle all the various versions and other companies working on it. Too big, too fast, without the manpower to back it up.What I don't like the most about this update is the fact that the last time we had a full update was 5 years ago (1.3), and so far what they revealed about 1.4 isn't even close to what 1.3, 1.2 or 1.1 were, and those took about 2 years to release. Also, the last time we had any update at all, even it being content not that relevant, was 2017, 3 years ago.
I don't know what is going on with Re-Logic, love the game since 2012, but overall 1.4 just seem lacking and disappointing for the amount of time they have been developing it.
So now we get lazy work with Master Mode.
In short, it's just not worth waiting on any longer.