At least they should add USB-C port on the side. Oh sure, even the iMac has to be as thin as possible, so that is not possible...
That is exactly the reason, why I always have a plugged in USB-C cable on my desk, as the back of my iMac is hard to reach. And I hate it...
I would use a USB-C hub, but in every test I read there was none without issues and all decent hubs need an external power supply, which I do not want for various reasons.
In the "old" days the USB plug at the Keyboard was quite useful, but they removed the option for the wired keyboard to.
Jus at this moment I am using the Mouse which came with my 2014 iMac and I also have the mouse which came with the 2010 iMac, booth are working fine (with Eneloops).
Yesterday I had to charge my MM2. No it is not a big issue, eben if I wish that the warning came somewhat earlier. I have not a full day when the warning is first shown. But it looks ugly and, when charging the mouse, there is always the possibility of bending the cable to much and damaging it.
I am still thinking, that this design is unworthy of a company which claims, that design is in their DNA.
At least they should offer a Qi option for charging the mouse.