I'm not surprised that they got tons of money from LB6 Servants, they're honestly amazing in terms of animation quality, and with an overall good story to accompany them it made people roll for them more. They can create really amazing stuff that other mobages can't replicate. My favorite was Barghest, but I also have to admit that despite my massive favoritism towards Godjuna, Morgan animations are really amazing too. The others are also really good, Sith being the one I didn't like that much.
But going like a full month without really releasing any content worth doing, with hunting quests being completely obsolete due to their change in drop rate for mats and new dailies (and LOL at having them at 1/2 AP during hunting quests just to make you want to do them less), is honestly a terrible decision, when they really should have used the momentum of LB6 to keep releasing stuff, minor or major. It should have been a good opportunity to actually release a Main Interlude for Prisma Illya, or maybe a Grail War taking into account how much people is starving for grails and lores due to the new coin system, or maybe Guda Guda rerun with updated raids, perfect place for people to use their Oberon teams.
I really hope that after Summer their schedule is more constant, because if not I can imagine all the momentum is just going to go away until we reach LB7, which is honestly a dumb way to carry the game.