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The range probably make more sense on a lightweight road bike with a 42t chainring instead, 80" seemed rather too low for a fast descent.
Use whatever ring you like, the proportional jumps between gears stay the same.
Of course, 1×10 won't do for everything, it hits its practical limit at a total gear range of 3:1, beyond that you really do need more gears to avoid annoying gaps. Even road bikes without mountain gears have more a bit more than 3:1 with 53-39/11-26, but 3:1 gearing coupled with a 2:1 usable cadence range gives you a 6:1 speed range, from walking pace to 24mph. Either side of that, either walk or enjoy the freewheel for all non-racing purposes.
I was thinking more about the 6 speed freewheel rather than 5 due to the middle.
The range probably make more sense on a lightweight road bike with a 42t chainring instead, 80" seemed rather too low for a fast descent.