Even if Feige and the entirety of Marvel Studios is open to the idea of doing a R-rated film, it will surely not be in the immediate future.
Feige has also said they’re committed to making a Black Widow solo film, so maybe she could be the R-rated answer.
Every studio is looking into R-rated blockbusters currently and that has brought Kevin Feige to now at least back off his stance that the MCU will never have one.
Marvel Studios on the other hand has been rather hesitant to lean into this trend.