I know it's probably not the best protocol but it's still similar to FTP which is transfer protocol just with encryption overhead. Actually I'm using WinSCP on daily basis at work and it's working fine for me
However I'm not going to convince anyone anymore because my switch is weird anyway. I'm a network engineer, hence personally I don't believe it's the best idea when I have so many SD Cards floating around. But that's just my opinion, everyone doing which works best. I just don't believe that any wireless communication beat good old direct copy. You know, I'm an old man, pre-internet. We used to send floppy drives via post to get warez :}