I use my SD card slot all the time and yes it is for "cameras":

- my two GoPros
- my DJI Mavic drone
- my Canon DSLR

With all of them in theory I could use the manufacturers app + wifi or plugging the "camera" into USB.

But in practice neither of those options are as convenient, fast or reliable as taking the SD card out and sticking it in the laptop SD card slot.

And I can't see that changing any time soon, unless Apple or the industry generally comes out with some sort of wireless transfer framework* that people like GoPro/DJI/Canon get on board with. Which I don't see happening, sadly.

So I expect to be popping SD cards into my laptop for a very long time to come, I've very pleased the new MacBook Pros have reinstated the SD card slot.

* I'm guessing that if I went searching there may well be such an attempt(s) out there from parts of the industry, but clearly if that is true it has not worked out...