I would be interested in seeing an actual study on belt vs. no belt. Everything I read seems like a lot of educated guessing and speculation.
I'd also be curious to take a group of "belts make you weaker" types, give them belts, and take the belts away a group of people who regularly train with belts. (And let's give them a week or so to get used to the switch.) Which will be greater, the increase in the first group's 1RMs or the decrease in the second's? Not exactly scientific, but might be interesting.
Anyway isn't the best of both worlds is to only use the belt for the last one or two warmups and your work sets, and never use the belt for deload/light/recovery days? Your warmup and recovery weights should be increasing as your work weights increase, so your "super raw" unbelted squat will increase, as well.