Devs see it as
Team jump rope Cannot have an unscripted attack pattern mixed in it. Cuz a lot of mechanics r like its all or nothing, hit or miss.
If bosses were more random A LOT of raiders would probs call it quits as the amount of skill needed to understand a fight would greatly increase and go beyond the watch vid strat.
Se spoiled a lot of statics with monotone 1-2-3 mechanic heavy fights that barely change if the static is on their game. That much control given to a player just makes them bored as they feel too safe.