This could not be more wrong.I just wish they'd left it as a rotating gig, something maybe aspiring actors or voiceover people could have tried their hand at. It's just reading questions, and any attempt to make it more than that is a stretch IMHO.
There is a cadence and command necessary from the host to optimize the game for the contestants. As much as I like Levar Burton, for example, he was way too inconsistent in his delivery and that led to fewer clues being unveiled. That means less money available to win - and it also means fewer chances for players to turn the tide of the game.
Trebek's gift was that he was so poised that the only way clues would go left unread is if the players had particularly bad games - wrong answers, especially triple stumpers, draw out the game. A good host can find ways to make up some of that time to help the contestants out.
The job is a lot more nuanced than reading off of a screen.