If I'm not mistaken, there's certain aspects of the game they can still provide updates and patches for without actually needing to render anything (and therefore not need to use the PS2 devkits). They recently increased the number of RoE objectives you can have active at a time due to being able to have more data on a character. There are certain aspects like that that still rely on the amount of memory the client has access to, meaning that such QoL updates are affected by the platforms the client is supported on. By taking the limited hardware of the consoles out of the equation, QoL updates can go further.