Less scripted fights more online engagement

[KisaiTenshi]

RNG is almost none existing it is like 5 to 10 % at max

I enjoy dancing but when it become 100% scripted it is just become boring

There is should some scripted phases and some have randomeness

Nah. You only want "random" dice rolls when it means the difference between doing 10000pts of damage and 10200pts of damage. That still can't be a huge window either otherwise you may as well throw away crit entirely. (Which is traditionally a "luck" stat)

When you start making monsters and bosses just choose attacks at random, what you get are people complaining that the content is too hard because it can't be learned.

https://www.youtube.com/watch?v=R87x98Q_LHg&t=18650s
Former Bizzard-WoW employee basically spells out this choreography fights is the games best feature.