The one product that really needed changing got the fewest changes of them all. The mouse is possibly one of the worst pieces of hardware (except the lightning cables), that Apple makes. Updating it, and not fixing the horrendous ergonomic issues, doesn't make any sense to me whatsoever. Especially if the asking price is 80 bucks. For 80 bucks you can basically get any mouse on the market and nearly all of them above the $40 range are way more comfortable to use.

They might not look as 'clean', but when I've made the decision to use a mouse I'm not worrying about whether my hand thinks its pretty enough for it. What I care about is how comfortable and accurate it is.

A mouse is a specific type of product, where the aesthetics actually play a very small role in how good of a product it is.

Apple has made products before that discarded comfort for looks, but usually they've made an effort to fix it when they come around to update the product. Look at the earbuds for example (although, that took quite a long time). So why did the mouse get overlooked here? It's not like people haven't made their complaints clearly, or loudly enough. You can put this mouse in anybody's hands and they'll tell you it's a bad experience (talking purely about the ergonomics here).