Yes, I understand all the legacy issues.
So, just for my information, why has the references to SWM been changed to SWiM if nothing changed?
"Simple answer" is DirecTV has changed SWM to SWiM. It's the same thing.
Nothing changed. Just some people use SWM and some use SWiM. I suppose the latter is used since if you sound out the abbreviation, you are supposed to say it like the word "swim".