I did some baroque harpsichord tuning in my past. Nobody I knew in the field of baroque keyboard tuning had absolute pitch, because it would drive you crazy if you did with all the wandering A's. When you want to flex between A=440, A=430, and A=415 (392 is a lot less common) regularly and your ear is tuned to a 440 A, I hear it gets really annoying because everything seems flat. In comparison, a huge number of piano tuners and organ tuners have absolute pitch.