I don’t do it frequently, but when I do I want it to take as short a time as possible.
Though recently simple things as copying files have been a challenge.
The point is that the technology now is far past USB 2 (and has been for some time despite Apple's persistence on using Lightning with such slower speeds) and the only reason they have for not putting USB 3 in the 15s (non-Pro) is greed. They were forced by the EU to convert to USB-C, so it looks to me as if they did the absolute minimal amount of work and effort to be any more consumer-friendly than they have to be.
They are reusing the SoC of the 14 pro in the 15 (as they always do), which doesn't support USB 3. On the 15 pro they have support for USB 3, and you can bet it will propagate down the iPhone line next year.
I'd rather the up-front greed that may force me to pay for a Pro model rather than the ongoing & increasing greed.
It was especially bad when they added prores without a way to offload footage at a reasonable speed.
And there probably is an element of spite where they don't want the upgrade to USB 3 to come too directly aligned with the USB C switch.