Built in rechargeable batteries are a plus, not a minus.

I disagree. I'm still using hardware that I bought at the turn of the century (a wireless mouse and an MP3 player) because they are powered by rechargeable AAA cells. If they used a built-in battery, I would have had to replace the battery, which is much more complex than changing a AAA cell.

I have three recent electronic devices that I would like to keep using but cannot, as their battery has reached end of life, replacements are hard to find, and changing the battery involves performing surgery on the device that I'm not confident I can do safely.

I consider them a minus because the proprietary batteries will likely fail before the rest of the mouse does. Using standard batteries means you’re not at the mercy of Logitech’s warranty when that happens. I wish more devices use standard batteries, but planned obsolescence is a hell of a drug.

Support for standard battery cells is seriously underrated! Especially when you are on-the-go and your mouse dies, all you need to do is swap in a fresh rechargeable AA/AAA. No need to deal with a cable or waiting for a recharge.

My wireless controller eventually convinced me that AA/AAA rechargeable batteries give the same benefit, but you can swap them in a few seconds instead of getting stuck waiting for a recharge.