To me, the beginning of the end was when Apple quietly dropped support for ZFS, despite having announced it, at the time, as a forthcoming feature in Snow Leopard Server. For this specific reason, I bought myself a Mac Pro, anticipating I could run ZFS across the four internal HD slots. I'm still pretty annoyed at that. Yeah, I could build myself a small OpenSolaris server box and connect everything over GigE, but I was attracted by the single-box solution.

Sigh.