There's a lot of nonsense in this thread IMO over this
The rule is quite simple and applies to all deadball situations, you can only touch the ball once and you can only touch it again after someone else has touched it, whether it's deliberate or accidental is irrelevant, there's no grey areas just simple acts
... yet not every dead ball it's the same, there are nuances, position of the keeper, placement of the ball if it's a corner, a free kick, a penalties changes, what happens if there is a rebound in those diff dead ball situations and so on, it's not that black or white.
One of the main nuances regarding penalties, it's that the keeper must mantein his position, so does the shooter, in the case of the shooter it's to avoid him dribbling his way, and the prohibition of a double touch it's in order to prevent that dribbling, to prevent to lift it and blast it, to avoid a feint that involves moving the ball from its placement, etc...that it's why they went for the plain and strict no double touch.
They wanted to avoid the shooter to gain any sort of advantage in an already advantage situation, the problems comes with new tech that would detect the most little of double touches, the problem comes when that double touch does not mean an advantage in the form of what they wanted to prevent.
Also a keeper it's
punished with a re take if he moves from his line and the shooter get's penalized with the goal being disallowed, it's not balanced, there are points in the rule that can be modified to make it better in those particular penalty situations.
Even recently they are close to avoid any sort of talk between the players, that existed since ever and never was an issue, yet since cameras now filmed such interactions, they felt that it's sthg that must be avoid, we like or not.
So to review a rule to make it better, it's not nonsense, in fact it happens on every law on every area, new costumes, new elements, many times end modifying laws/rules and even in some cases, some laws are not even executed even still existing, they fell alone, without even being analyzed, just not been used.
Not the case here of course.
As the rule stands, there is only one minimum concern, the part that talks of clearly moving. In this case, the VAR determinated that it was clear, so be it, it's done. Under current rules, if they see that, it should be disallowed.
Another thing it's that given current tech and its forensic approach, sometimes it can go a bit against the original idea behind the rule in question, so to open a debate about how to improve it, its' really far from nonsense or silly.