Is it wrong to compose and not being able to play it?

Absolutely not what?

I think he was referring to the question in the title.

If you are composing at the piano, how likely are you to write microtonal music?

Depends on how willing you are to retune it every minute or so.

If you are composing at the piano, how likely are you to write microtonal music?

lol... I CAN understand why you would want the piano if you were writing to accomplish certain things... :)

Shun the non-believer!! SHUN!! Shhhhhhhhuuuuuuuuuunnnnnnn

Actually, pianists have the unfortunate experience of unwillingly playing or accompanying microtonal music when dealing with a mistuned piano or fellow performer.

Starting with classical guitar, you've expanded to include mandolin and banjo, even writing your own guitar-banjo duet. Learning piano, violin, viola, flute, clarinet, and trumpet shows dedication. Writing duets for various instruments demonstrates your versatility. Adding a cello to your collection sounds like a great idea!