Jumbled up the words in thta last post. Here goes again:

"Prissy" means "prim or prudish" according to my dictionary, confirming how I understand the word.

I'm trying to work out how a guitar technique can be prim or prudish. ("Make sure not to show your legs", perhaps...)

Would I be right in speculating that what is meant is when someone playing a guitar to accompany a song seems to be more concerned with   instrumental technique, rather than with helping get the song across?   In which case, of course, that can happen with any way of playing the guitar, including what I take to be meant by "dynamic rhythmic style".