Alright lemme redpill on some shit. Johan actually can't draw realism. Like at all, a few artists like Dereck J are like this too.
The people in the comics and art community don't think too highly of people like that, and some resent them if they manage to make it on sheer ignorance alone like that. Artists also don't like Alex Ross much, the reason being, from what pros have told me, is that not only did he have every advantage growing up in a rich artists houshold with great teachers and advice, but also because he made it big with a few pieces, and now he basically only has to draw from life. What I mean is most of his stuff he uses only live models that he hires because he can afford it, and a lot of artists resent that, especially artists who are better than him in technical skill but jsut never got the lucky breaks he did.
Aside from this, most artists that aren't recent hire ons (this is mostly for marvel mind you) can draw in multiple styles. If you want an example, take a look at Butch Hartman's twitter feed, you can see the man is clearly competent in drawing realism as well as in his signature cartoony style. Or you can take a look at mangaka like the artist for Narutop, where in one of the first few books he drew a realistic depiction of Naruto exceptionally well. Or even the guy who does attack on titan who clearly can draw realaistic human forms when prompted.