[trgn]

Yes and no imho. The piano is a beast of an instrument. It's an accommodating instrument to play something fairly simple fairly fast, but then there's an enormous wall to climb up on. It's really difficult to be a good self-taught piano player, the learning curve is steep beyond the basics.

Also, playing beginner piano doesn't practice your hearing as much as a stringed or wind instrument. I think it's important for beginners to learn to listen to what they play and adjust their intonation accordingly. Guitar, even though fretted, really does requires players to listen intently to pitch and tone from day one.

I'd say music theory and harmony - broadly speaking - makes more sense on a guitar, than it does on a piano. Solfege, yes, that does make more sense on a piano, but imo most amateur musicians really don't care about that particular approach to music education. And for rock&roll and country/blues, it's really not all that important either.

Apart from all that, yes, of course, piano is an amazing instrument, but much harder than guitar in the mid to long run.