It is misleading at best to create an acronym for a Church when you know quite well that the Church does not use it.
Clarity is always a good thing. Considering the bizarre world of internet Orthodoxy, ROCOR-MP is a logical name.
I suggest "GOA-Ph" because most people can mistakenly think it is an archdiocese of the Church of Greece. Of course it is not. It is an archdiocese subordinate to Constantinople.
It depends on the context. If there is a discussion where the two are likely to be confused, simply saying GOA may not be the best choice. In this case we are dealing with a jurisdiction hopping nutter (and these types love the various übertrue whatever jurisdictions) hence clarify that ROCOR here in fact means the mainstream ROCOR that is part of the MP is logical. Depending on with whom I'm conversing I alternate being being Orthodox, Ukrainian Orthodox or UOC-MP depending on the level of clarity desired.
The acronym was created by dissidents. It says that we are part of the smorgasbord of about 12 uncanonical groups which are using it.
No, it says you are a part of the MP. It rather swiftly distinguishes you from the others. I'm trying to imagine a conversation:
Unwashed sinner: Nice robes and bling, what church do you belong to?
The Holy Starets: ROCA
Unwashed sinner: Isn't that a brand of clothing?
The Holy Starets: ROCOR
Unwashed sinner: What is that?
The Holy Starets: That's the official name of the church
Unwashed sinner: hmmm, so you mean like the MP?
The Holy Starets: NO!!!!! ROCOR.