One of the things that sold developers to PSX was that Sony took a huge effort to provide a great SDK with the console, something unusual from the other vendors.

This was another reason they got lots of flame with the PS3, as not only was it hard to program for, the SDK wasn't that great.

Hence why they spent around two years time bringing out a great graphics debugger developed with input of teams like the Gran Turism one, and a middleware for prototyping ideas, PyreEngine.