I agree that it feels weird at first, but thinking about it this way fixed that for me: The whole reason for the apparent paradox is having the "50/50" choice

I agree that it feels weird at first, but thinking about it this way fixed that for me: The whole reason for the apparent paradox is having the "50/50" choice at the end. You either keep the door you picked, or swap with the other door, so it feels like no advantage. If they only revealed a single door, then you would have multiple doors to swap to, so you wouldn't have the "50/50" choice. The only way to keep the "50/50" choice at the end is to reveal all but one door and give you the option to switch to it.