Is it to do with speed or tolerance?
I have 2 Chainsaws, One uses 1:40 the other 1:25 . It is annoying to have 2 separate fuel containers.
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I owned 2 stroke dirt bikes for years. The ratios have a lot to do with longevity as well as simply being manfacturers recommendation. Not uncommon to run 50:1 but we ran 20:1 when I was a kid. How lean the carb is jetted makes a difference too as lean runs way hotter. You will find recommendations all over the map for dirt bike ratios. There’s nothing fundamentally different in a sled motor, jet ski, dirt bike or chainsaw when running premix. The more oil generally the better protected your engine is.
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