> By the end of freshman year, I had significantly expanded my musical tastes and unambiguously had perfect pitch… for piano only. I find it highly unlikely that this was due to identifying microtuning differences;
I think the more convincing theory for instrument-specific perfect pitch is that one learns to recognize the timbres of the individual notes, not any minute variations in pitch.
> Don’t learn a non-C instrument
I would recommend against this because it severely limits your options for instruments to play.