Im not in disagreement with you, necessarily, about including it on unranked. If it were up to me, and more people were (hypothetically) playing online, I would filter it out.
Here is the part I think you are overlooking. I'm not saying you have to agree with it, but it's a valid point to me, and I presume it is to others across the spectrum of skill (I'm terrible, and like some others on here, have just an hour or two a week to play):
Adding the indications to the grapple scenarios changes 'realism' attempted to be built into the mechanics. Most importantly, it moves the play toward something of an exercise in who's best at "Simon Says."
Though flawed, the developers did a pretty good job building grappling system based on movement, and something of a respectable set of controls with relevant inputs based on timing and situational recognition, as well as some elements of reward for successful pre-emptive and reactionary measures.
Main point isn't about more people getting better, or what's fair or any of that b.s... I don't want to play a game that has elements decided by a quick trigger finger based on reaction speed to an arrow that pops up on the screen.
Anyway, there is another viewpoint to consider. Whether you vehemently disagree with my extrapolation, and conclusion, I figured it was worth sharing, just so you could see an argument from someone who couldn't care less about winning, but rather, values the pre-text of what I believe (hope) is a relatively fair contest in which we aren't partaking in two different skill-challenges during the same contest.