Yeah, megahertz is maybe the best example of all!

    and I like that about non-engineering - normal people:
    if it isn't perceptibly better then... _whatever, next!_

Well... I like what you are saying, but I think there is additional nuance.

There are a lot of things that are "perceptibly better" that only reveal themselves over time.

Probably the best example would be the benefits of well-designed physical controls in cars, relative to poorly designed touch interfaces. Unless you're really attuned to UI design it's hard to understand how aggravating bad touch interfaces are until you've already bought the car and spent some significant time with them.

Same with things like boots. A poorly made boot is most definitely going to be perceptibly worse over time even if you are are not a "boot nerd" but it is hard to discern this up front.

A display with great HDR support is kind of like that. It's most definitely perceptibly better even if the viewer doesn't care about tech crap. But it's harder sell.