I agree on it being optional, though there are downsides to implementing this into an MMORPG, as seen with fighting games, which is a completely different genre, but if you remember how fighting games have simple mode of operation, i.e one button just does the 1-2-3, another button does the more complicated for you without delay but is very limited on what you can do after, , and another button does the super damaging moves that is similar to the second button(Capcom fighting games are known for this sort of thing to get players somewhat interested in the gameplay and pioneered this feature and Arc System Works revolutionized the feature) but then you have normal mode of operation which requires to figure things out on your own, and each mode of operation has it's pros and cons, and if happen to have at least some experience with fighting games and see the simple/normal operation control selection when you choose your character then there is a good chance that you might check what the differences are between the 2 modes of operation. In my case, I'm not that good and would lose at fighting game tournament within the first day. So locally, I'm probably just okay at playing fighting games, but the first game fighting game that had these features is a bit of an obscure one, and it's called Tatsunoko VS. Capcom: Ultimate All-Stars on the Nintendo Wii, and it's what got me to stay interested in fighting games, albeit for the fun factor. I tried the Simple Mode of operation first and had a bit of fun, but then I tried the normal mode of operation and it was like playing a completely different game, but at the same still felt the same and it was just as fun learning the differences between the 2.
But TL;DR is I am okay with a simple mode of operation in FF14 so long as it's optional, which is probably why I'm more frustrated with DRK and everyone asking for things that actually effect the gameplay of a lot of classes in a negative way...