Because of the way RPGs were originally designed to work. Its all background rooling of a thoretical dice. Thuse, a "chance" to get a crit, not something like an attack combo you can just repeat over and over.
Pretty much this reason.
Action RPG it is.
A little action,.....some RPG?
We need a bit more RPG to the formula I think.
Wish we could have magic failures again.
RPGs are dependent on "character's" skills not the player. Hence dice roll. And lots of numbers and character sheets....and stuff.