Each microSD card has its own controller and there are dozens of companies making their own controllers, each with different firmware.
This is probably why Apple hates add-on storage. They're used to coding for only Apple approved vendors.
And yet $10 digital cameras and $1 SD->USB readers from ebay and aliexpress have no trouble supporting all thoses controllers. But a $2000 computer from a $2 Trillion company can't seem to handle them.
Tim Sculley really should be running a company like Pepsi where all that matters is marketing and there's minimal product innovation. He is a widget salesman with no interest in tech and it shows in everything Apples does.