What was listed was not PS3 limitations.

PS3 did however hold the game back in some areas. UI, modelling, and such.

It also ate dev resources that could be better spent on improving the other clients or bringing the game to more platforms (NX and XBone) or maybe a real mac version instead of a wrapper version.

There may be things planned for 4.0 that simply wouldn't be possible with PS3 as well.

Other than PS3, support for non-SSE4 CPU's are also being discontinued.
All this is to raise the minimum specs so they can increase various design parameters.