Plus there's the fact that the more technically ambitious guitar-playing kids who would previously have been into fingerstyle are really into all the tapping and knocking stuff - what's called "percussive fingerstyle". Can't stand it myself - if you want to play percussion, buy yourself some congas! it's a gimmick that's become institutionalised.

Here's some nice slide 'n' fingerstyle from Leeds' one and only young Woody-Guthrie-loving skateboarder Serious Sam Barrett to remind me how it's done properly. I think he's playing a 12-string Stella:

Serious Sam Barrett playing blues in a Leeds barbershop