This is pretty short sighted. The PS3 version has a MASSIVE potential to make the game more successful and profitable, as it opens it to a very large audience that's sensitive to the Final Fantasy brand already.
Opening the game to a wider audience and making it more profitable is an advantage for PC users as well, for obvious reasons.
the "PS2 limitations" part I guess refers to Final Fantasy XI, which is an entirely different animal. The PS2 limited the PC in FFXI because the game was created for the PS2 and then ported to the PC. There was little upgrading that could be done without redesigning the assets completely, so the PC version didn't look too stellar.
On the other hand FFXIV is developed with PC as the lead platform, which means the PS3 version doesn't limit the PC version at all.
They could run on a completely different graphics engnine and still work together seamlessly online as the only necessary common denominator is the data flow. All the graphical assets are client side. As long as the assets that offer a level of interaction with the players are in the same position, the PC version could have gorgeous green grass made of 212232 polygons per blade and the PS3 version could have purple grass made of cubes and it'd change absolutely nothing functionality-wise.
Again, the PS3 version doesn't "limit" the PC version in any way.
I'm sorry, but you're completely off mark. Those elements were not changed for the PS3 at all.
The split maps are to reduce server load and latency as every map is a server in the cluster. They're there to avoid having servers bogged down too often by maximum traffic. having zoning instead of a seamless transition between one server and the other (areas were still divided in different servers before, but the transition was partially invisible and you'd notice it only when zoning with someone else and they briefly became invisible) helps them optimize and reduce server load, and keep lag low.
The slight graphical downgrade in some areas was done in order to optimize the engine, let it visualize more than 40 players at once and introduce effects that previously were lacking, like dynamic shadows and lighting for instance, andthat's a BIG graphical improvement that eats a lot of resources.
Again, it has nothing to do with the PS3 version. For what would matter, characters could be photorealistic on one platform and and made of sticks on the other, and they could still be seamlessly paired.