> After a full decade of USB-C, how is it that we’re still dealing with this old port?

Not satisfying, but that's because changing the USB connector on an already-finished (and certified!) product-design doesn't come for free. And with connectors and especially USB-C cables being significantly more expensive for quite a few years, it was a sensible choice to go for microUSB even though USB Type C was already available.

> It’s not just a random HP photo printer. A few weeks ago, I bought a cat nail grinder that unfortunately charges via Micro USB

I guess the cat nail grinding industry didn't face any disruptive technological innovation in the past 10 years, so newer versions of the product are merely facelifts of the existing design