I don't know the answer... but in engineering often these sorts of limits come from optimization calculations reflecting tradeoffs from various opposing factors.
E.g., you want the minimum wheelspin speed to be fast enough to ensure that the aircraft is "planted on the ground" (not bouncing) but not so fast that the logic prevents operation during a critical moment (e.g., while hydroplaning in the wet). So there's a tradeoff between the two.
The engineers would collect all these tradeoffs, make a min/max "cost" function, put in some constraints, plug them into a solver, and voila... the computer spits out 37 m/s or 72 kts as the optimum tradeoff.
I'm simplifying of course. I think the Boeing equivalent logic requires higher speeds, 85 or 90 kts, probably based on a different set of tradeoffs.