It's great until you get a temple fully unlocked except for one last connection, then two incursions in a row fail to drop a single stone and instead of a full clear you lose half of it including both a treasury and the boss. Rare mobs should just drop a stone 100% and I think that would solve the problem, especially since people were saying in-game that it's not even guaranteed to drop a stone if you fully clear an incursion.
It's pretty damn hard to pick up the stones sometimes too, I've lost more than one connection because I wasted a few seconds mis-clicking. Already have the font size set to the maximum possible in filterblade too.