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currently I'm running 9 sp XT cranks and 9 sp rear. these rings will fit my current 9 speed SRAM chain, and also my future 10 speed chain and new 10 sp cassette?
IIRC. 8,9,10 and 11 speed cog and chainring teeth are all the same width. The inner dimension of chains has not changed since 8 speed. Only the outer plates are thinner and the pins are flush. There is no such thing really as 9 or 10 speed cranks. The tabs and spacing has not changed for some time. Prtty sure 8 speed cranks have those dimensions too. The rings do have different ramps and pins to better pickup the chains to shift.
Debate? Bikes are made for riding not pushing.