Yeah but I know the Atari, Commodore, Amiga, Master System and consoles before that all used DE-9 ports. DE-9 was like the USB at the time. You'd think a converted would be made for them by now.
Yes, but they won't work safely outside of the consoles and sometimes it couldn't work at all.
Thet weren't designed nor tested for another consoles.
For example if you use Sega controllers on Commodore machines, somehow if you pressed "B" and hit a keyboard key at same time, it could fry the chip.
Sure making a converter could solve that but it's only needed 1 machine to test, while USB needed a lot of PC and operating system types to test.
Back then there weren't many types of PC configurations and operating systems like now.