Me, no other way of doing 25+ mph without going mental.
My bikes get used both on and off road, sometimes pulling a trailer or carrying bags of shopping, sometimes not. I have no intention of throwing a load of cash on a drive train which will give little or no benefit over what I have now, spinning at 120rpm in order to make decent headway on downhill road sections isn’t a good look either imo.
Think of it as a 3x 1x.