I’m not planning to throw that watch away ever. So why would I be throwing my mouse or my keyboard away if it’s a fantastic-quality, well-designed, software-enabled mouse?

Because watch technology is mature and isn't changing. Nobody's making a better watch every few years.

That generally isn't true of computer hardware.

In the 1980s, you had maybe a one or two button mouse with mechanical optical encoder rings turned by a ball that gummed up and would stick.

After that:

• A third mouse button showed up

• A scrollwheel showed up

• Optical sensors showed up.

• Better optical sensors showed up, with the ability to function on arbitrary surfaces and dejittering.

• Polling rate improved

• Mice got the ability to go to sleep if not being used.

• More buttons showed up, with mice often having five or more buttons.

• Tilt scrollwheels showed up

• Wireless mice showed up

• Better wireless protocols showed up

• Optical sensor resolutions drastically increased

• Weight decreased

• Foot pads used less-friction-inducing material.

• Several updates happened to track changing ports (on PC, serial, PS/2, USB-A, and probably soon USB-C).

• The transparent mouse bodies that were initially-used on many optical mice (to show off the LED and that they were optical) went away as companies figured out that people did not want to have flashing red mice. (I was particularly annoyed by this, modded a trackball that used a translucent ball to use a near-infrared LED back in the day).

If wristwatches had improved like that over the past 40 years, you likely wouldn't be keeping an older one either.

If you think that there isn't going to be any more change in mice, okay, maybe you can try selling people on the same mouse for a long time. I'm skeptical.