Because those who make that choice believe (or have data proving it, but my feeling is that usually they just believe) that users are too dumb to understand.

That's a real problem in many situations: users are often under-estimated (they are also often dumb, which doesn't help).

They should invent a measurement unit for trackpads/touchpads, whatever we call them. Then a grade 5 touchpad will be immediately perceived as better than a grade 4 one. Or Basic, Business, Elite. Marketing teams are good at that.

Microsoft tried "precision touchpad" and I think there was some uptake. But you never see it advertised anymore, so maybe it didn't drive many sales?

They made it a requirement for Windows 11, so the term no longer provides any differentiation.

I can get on board with that. Just some kind of language to describe a touchpad in marketing material. Without it, it is hard to see, without living with it, how a touch pad differs across two or more devices. I tend to think of touchpads as Mac touch pads and non-touch pads. Even though that is wrong.