Pointless restrictions.

[Niwashi]

The UI developer has said a number of times, the restrictions faced when designing the UI, due to the support of the PS3 platform.

Not relevant to the type of issues brought up here. Just because, like every other game in existence, there's a few features they have to design around low-memory clients (which includes low-end PCs as well as PS3) doesn't make every poor design decision a symptom of it. Some players like to joke about saying "PS3 limitations" in regards to just about everything, but you may have failed to notice that that's just a joke.

I imagine, on next expac, PS3 support is going to be dropped or discontinued for the expac content.

Even if that were to happen (which it eventually probably will for some future expac, though expecting it for the next one seems a pretty wild leap), it would only impact the expac specific features. Features that are shared with the base game would still support all the platforms that the base game does. Keep in mind, their other MMO is still supporting PS2 as far as the base game and first few expansions are concerned.