Single letter names for Proxies

[markHadman]

"single letter variables can't hold a proxy, I generally use them to hold other things such as lists if I need them during performances.

I don't know why single letter variables don't work. They just don't."

In what way don't they work? Is there some way they behave differently?
I have files going back to 2012 that contain one letter proxies. (Admittedly they're static setups rather than performances, so they might fail if I tried to do something 'live' with them)

[theseanco]

I'll re-write this bit. Wrote it in a bit of a rush and it's really not clear.