It's the idea of not having a home baseball field for games and practice.
Personally, I enjoyed watching big games at Phoenix Muni the most, but there is a time and place for everything. Mesa's Rendezvous Park also used to host big games before it was tore down.
Btw, I wonder if they changed the batter's eye in center field in Muni. IIRC, it used toread 425-430' at the base.
I once saw Ron Hassey of Arizona hit one over the top and still headed up like a rocket. It was amazing. Hardest I have ever seen a baseball hit.