I loved the original MX Anywhere too, but I found that iFixit offers a replacement Lipo for the MX Anywhere 3

https://www.ifixit.com/Guide/Logitech+MX+Anywhere+3+Battery+...

It looks approximately as difficult as changing the battery on a smartphone.

Knowing that the battery could be changed gave me the piece of mind to switch.

The battery management on the MXA 3 is really good - lasts a very long time and is quick to charge on USB-C. The Logi Bolt has been trouble-free. Changing to other devices via bluetooth is handy if you have multiple computers. The magnetic hyperscroll takes a little getting used to but uses a lot less force to switch modes.