Lol. It’s because watts are typically associated with work done by electrical systems even though they are simply a standard measure of work done.
Both watts and horsepower are measures of work. More specifically, they are units of power or the rate at which work is done…
… 1 horsepower = 745.699 watts
… 1 kilo-watt = 1.34 horsepower
Fair enough, but if someone tells me “my car’s engine = ‘x’ kW” I’ll say “Ooh, neat, what’s the battery range? Restorative braking, then? Hybrid or 100% EV?..”
You do realize that HP is measured differently between Europe & Asia vs. North America? Whereas kW is the absolute nominal output of “a power source” regardless of how/what it transfers to the rest of the equipment.
It’s only different in different regions because sone regions use brake horsepower, some use wheel horse power, and some use the actual engine horsepower.
It’s not that horsepower is different, it does have an actual definition, but the value can be different based on where it is measured depending various factors.
kW is a measure of the actual engine output. You could use kW measured at the wheels, for example, but you never see it because it doesn’t make sense. A compatible HP figure is the actual engine HP.
Horsepower also sounds way better. My cars got 500 Horses sounds a lot better than my cars got batteries. lol
It should as i said be down to preference no matter what. That’s like saying all cars should only have right hand drive, or only have manual transmission. It doesn’t follow because not everything is applicable everywhere for everyone. There are differences for many reasons, most of them valid for their regions.