Doom is synonymous withthe MCU’s Tony Starkinsofar as they wish to protect humanity.
Hiding RDJ behind a mask throughout his involvement would almost entirely defeat the purpose of bringing him back.
Will Avengers: Doomsday Change Doom’s Origin?
With that in mind, making him remove his mask at every tiff and turn sounds far less likely.
Doom may not remove his mask willingly, but it may come off by force.
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