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Belagerent
Since chainstays aren't straight tubes, there needn't be any correlation between tyre clearance and axle width.
The single only consideration when looking for more tyre clearance is crank arm and chainring clearance.*
You could very easily build a boost frame with space for only 25c tyres or a 135mm QR frame with space for 2.4"
Don't believe everything people tell you if they're also trying to sell you something which fixes the problems that they tell you exist
*given you've already chosen your tubes for maximum clearance. ...and BB shell width