For decades, every MTBer knew that 26" wheels were better in every way than anything else. Only beardy tourists rode 700c wheels over mountains. Only really beardy tourists ever rode 650b.
Unable to handle the truth, MTBers were forced to rename these wheel sizes so they could be spoken, and they have now been recognised as the best wheel size.
I ride 70Oc and 26" on and off road. 27.5 is a sweet size hampered by lack of commuting tyres available in bike shops.
The most important factor was that 26" was a universal global standard from low end to high end. That standard has been broken.
There is a practical limit to the number of different wheel diameters that a bike shop can support and so quality 26" rubber is becoming less well supported but is still a good choice.
Completely agree, I always found I ran out of torque a lot less on 26” wheels,
a bigger wheel rolls easier, but it slows down more in any given gear when pressured,
this then requires more effort from the power source than a smaller wheel in the same
gear.
I sold a tractor to a man, he put bigger wheels on, ripped the splines off
the shaft in the gearbox, the tractor shuddered taking off in the same gears
starting off in first as my exact same tractor, which pulled far bigger loads
for a far longer period of time, my gearbox is as good as new, I could hear
the added pressure destroy the other gear box because of the larger wheels.
I also like being as low as possible to avoid the wind when cycling, going up
makes no sense to me.