Hmm, should and wrong are not words I'd use in this context. The game developers decide. Just like we can't have 6 flat across the midfield or other stuff, a line gets drawn. But.....

.....I would like freer choice with SAs. Some are position restricted like GK ones, some are likely to work only for some positions like 1-on-1 and Aerial Defence (so restrictions are needed to protect people from themselves) but most others could be free of restriction, including Dribbler....so yes I agree, but only if Defenders have more choice too.

Playmaker is just a name for a boost to passing, it doesn't redefine a players role afaik.