I posted this back in the old thread a couple of years ago so I will just copy & paste it here:
On the casting question...
We've had 10 years of films now where Marvel have been shrewd with the castings of the major/lead roles and for the most part have picked actors who are not far off the looks of the comics. RDJ, Evans, Hemsworth, Hiddleston, Johansson, Olsen, Pratt, Cumberbatch, Holland, Boseman, Larsen...they got a solid record in picking actors who either already look like the comic book character, or can without too much effort.
Now I like to think that this isn't by happy chance but rather because Feige recognises there is value in the comic book iconography, and having the leads for the movies follow that more closely than not is a desirable goal.
And it's worked pretty darn well so far.
So with that said, after we fans have been hoping for years for a reversion, it would be a shame for Marvel to change a tact that has been so popular and successful for a decade and cast against type for the FF.