Entirely true.
What is of more relevance is how often his lack of movement and positioning leads to games passing him by, how few ideas he has despite having the tools to execute far more ideas than for instance Lingard, and how relatively dependent he has been on being used in a particular way to be effective, both for United and France. (Haven’t seen much of him for Monaco). It makes me speculate that his creativity and game intelligence isn’t too high. I think it’s clear that Rashford, Lingard or McTominay, given Martial’s touch, ball controll at speed, and precision in delivery, would assert themselves far more on most games by now than Martial is able to.
Again, if that’s his strengths and weaknesses, it does not make him an ideal Mourinho player, he would suit Guardialo better I believe, and that’s not to say that Guardiola (who couldn’t use Zlatan) is better at utilizing players.
Rashford hasn't shown any superior level of football IQ to make that assumption. He makes as many, if not more, boneheaded decisions. Also, if I had Martial's touch and ball control at speed, maybe I would be a professional footballer. None of the names you mentioned have his touch or his talent. You can talk about the motor if you want, but motor with very little end product ends up maybe looking better but not doing feck all about the end result. Martial, at least, has made improvements this season where even if he had a poor game (like the rest of the team often), he would still produce something, whether it was an assist/goal or a chance on a platter that wasn't finished.
He is so polarizing, it's really fascinating to read some of the comments on this thread. Nevermind the fact that most teams would want him in their club, there are some who act as if he should be grateful to get the treatment he's gotten this season once Sanchez arrived (who has had a much poorer season than Martial, whether it was pre or post transfer). There is a very strong support for him (Martial FC) and an equally strong dislike for the support he's getting, not necessarily the player himself although he frustrates a lot as well. I think he's got one foot out the door, though. Living in Manchester can be bearable if you have the support of your coach and are playing week-in, week-out. However, if it's to be a player who gets benched for every excuse imaginable while the rest of the team is allowed to play through their bad patch, and he's likely to not make the world cup squad at this rate, then why would he want to stay?
I don't think him starting the next few matches will change anything, perhaps the damage is already done at this point. If he winds up going to the world cup, and has a frank talk with Mou, then there's a chance he'll stick around.