The Problem is grinding...
Its not the "normal" thing, because in FFXIV you have to grind Content (not just items or xp)...
When running 100 times the same dungeon to get 100 items, but you need 10.000 items for your aim then at some point you just get crazy and become toxic towards others because of pure frustration! There are even calculations where you will need "years" to accomplish achievements in FFXIV (For the Notes: If you play only this single content, no variation that whole years).

Its not the grinding itself, its the scaling and incredible stupid balancing around it. The reward is not worth it and instead of lowering the grind they just giving insane rewards. Out of frustration players quit, but those few who burn out can get it...