I had a lesson with my first guitar teacher today, and he's still meticulous as ever. But it was refreshing to be criticized for my sound than for my sight-reading or limited repertoire. He got me a new book for guitar, it goes from the very basics but covers a lot of styles and includes theory... Ironic as it may seem, he considers me an advanced student, and for this reason, he is bringing me back to basic. The arguments for slow practice and use of the metronome are compelling, although I'm at a loss to describe in my own words. It also makes sense to touch on different genres/ styles other than classical, and learn to harmonize with a band.
I am wondering if this approach would be beneficial for piano also. The pressure to expand solo piano repertoire is intense, though. My head is spinning because some people might argue that you can gain technique from difficult pieces, etc, and they think I already sound good, but it's not good enough in my opinion.
piano vs guitar
classical vs variety
solo vs group (band or classical chamber)
more technically difficult music vs solid foundation
more pieces vs less pieces but better sound............ etc.
Practicing is all about how far you can go, and how deep you can dive in there. That in itself is like a performance, and your interest and love for the music shows. I know I am interested, I am in love, but I don't know what is the right thing to do, or how long I can keep up with this. It's not always heaven; most often it is the hell of frustration.