how good does one need to be to be -P name worthy?

Im oteto LMA! Lyrics mix arrange.... lol

Looks like the "-M" is needed for those who mixes a lot of songs //*pleasedontkillmeOTL*

Eh, I think it's more for someone who creates original work...
-Producer
-Lyricist
-Artist
-Video maker

just a few ideas.. I'm not really suggesting them for use, since -P is the most used

I really hope "-A" "-L" and "-V' become things.
Except the only problem would be if someone did all these things. like: ____-P-A-L

Yeah, I hope so, too, but I'm also curious about how would that work. Often -P names are connected to one of producer's popular songs. If a person who could have an -L name collaborated with only one producer, it would mean that their -L name would come from this producer's song as well. If a newbie came across this lyricist, they could confuse them with producer of the song they had in their name.
As for -A and -V, I agree, they would be really nice. But still, many people create their own artwork or videos for covers, so work of original creators isn't seen as often as producers' or lyricists' work - a cover wouldn't be possible to create without music and words.
I hope it doesn't sound stupid... Anyway, if these really came into use, -P names wouldn't be the only ones which people desire. I think it would really encourage users to actually collaborate with producers who can't do everything themselves. That's why, in my opinion, it would be great to have them as well.

And for the actual topic, I think it would be hard for any less-popular, but still good producers to stand out while there are so many famous Ps now, so the expectations shouldn't be too high. In my opinion, a -P name user should have at least a couple (like, 6-7) of originals done and published, well received by the community. I don't mind if they create -P names for themselves if original work is majority of what they do. But I don't like it if they make -P names out of their forum/Twitter/YT/SC nicknames. It sounds really forced.