Earlier quoted context omitted.
IMHO there is plenty of scope for an 'improved' mouse. We get why there is a dongle (Logitech) as the speed and reliability over Bluetooth is not good for gaming and other performance uses, e.g. Photoshop. However not everyone wants one of their USB ports filled with a dongle so Bluetooth is useful, particularly if using the same mouse on more than one device. I think there is a market for a mouse that can be either…
Logitech already makes that, and while it's expensive, it's one of the best mice I've ever owned. You can use a Logitech dongle, or Bluetooth, or wired. And it can be paired with up to 3 systems. https://www.logitech.com/en-us/product/mx-master-2s-flow
I can use it as a Bluetooth mouse, while charging from my USB port, but I can't use it as a USB mouse.