>>11848024 (OP)For the PS1, Sony was practically giving away devkits to third parties, and they were able to sweeten the deal by including both the same documentation that Sony themselves used as well as pre-made code libraries to help programmers get started with the software. This is why so many games wound up going to the PS1 in the first place. Being able to publish on cheap CDs was secondary by comparison, since Sony still fully controlled the manufacturing process.
For PS2, Sony arrogance kicked in and they were far more conservative with the devkits. They prioritized companies that would guarantee exclusives, and it's also when they began implementing their parity clause where the Playstation version had to either be the best version available or include some sort of exclusive feature the other versions lacked which, in their defense, made sense because a lot of multiplats ported to the PS1 sucked dick, Saturn held on in Japan because it had the better home ports for 2D arcade games. The documentation they provided lacked a lot of hardware information, but more importantly they also decided to withhold providing code libraries to third-party developers entirely.
So you have this new console, with this new, proprietary hardware that nobody's ever seen or heard of before, and you do everything in your power to block people from learning how to make the most of it. That's why most developers just used the emotion engine like a normal processor, and PS2 ports suffered because of it.