RNG is in every game to some extent, however, FFXIV seems to have randomness in almost every aspect of the game. I think too much RNG tends to wear on people after time.
Dungeon drops (mostly tank drops from T6-T7 for weeks now, just downed T8 and guess what, tank drops)
Atma drop rates or Alexandrite from fates
Harvesting nodes for HQ, both mining and botany, fishing can be the worst of the 3
Assimilating SB items for materia and praying for something useful
Transmutation by Mutamix
Affixing materia to anything from gear to Novus scroll
The desynthesys system for demimateria
Now gardening with the minions, grade 2 or 3 choco food, being random seeds. Seems the intercrossing does not guarantee you will get what was expected.

So yes, random is random, RNG is RNG, but overplayed it becomes very taxing.