I have a few adaptors. One is plugged into my occasionally used DVD player. My Time Machine drive has a couple of USB-A sockets that I can use, but my DVD player won't work plugged into that (not enough power?). I have some old unpowered USB-C hubs. When I have a USB-A memory card plugged in, I periodically get pop-up messages telling me "Disk Not Ejected Properly", but when I check finder, it's connected fine.
I'd like to get rid of USB-A altogether.