The example I can think of is the Monster Hunter Frontier Z collaboration where I can envision the clothes and weapons could definitely be PSO2 Meseta for sale provided a visual upgrade alongside everything else but I do not exactly know how the licensing or the way the legal side of the collaboration functions where I'd wish it had been as easy as Sega going through and updating the resources but I don't know about how much of Capcom is involved in this procedure.

The same is applicable to collaborations such as the Final Fantasy XIV cooperation with Odin (which still exists as far as I know) where I do not understand just how much of Square Enix is involved that for Sega to have the ability to update assets . When it was only just Phantasy Star-related things (such as character outfits, cameos from different games, or other Sega-related properties) I could imagine that this probably would have been achieved, or at least would be carried out. But in the worldwide variant we already don't have the presence of Cougar NX so that I don't exactly know if there are other complications seeing Sega's own properties which may also contribute not to upgrading everything they can within reason.

I can envision that likely out there we will still see someone wearing those older cooperation things even when they are not rigged up to the same standards as new makeup in an identical manner and that there would have been outrage when it was made unusable or obsolete. Collabs that have had their cosmetics removed nevertheless have their assets exist on the sport so those will probably still be available for jp players.

Only improvements we'll probably see is the new engine improving shadows, shadows, colors, particle effects and casting them from the outfits. You may have a look how exactly implementing better shadows and colours can enhance old equipment by checking ReShade screenshots. Collabs that have experienced their makeup removed still have their resources exist on the game so those will probably still be accessible for jp players. Only improvements we'll probably see is the new engine improving shadows, reflections, colors, particle effects and cheap Phantasy Star Online 2 Meseta casting them from the drapes. You can have a look how exactly applying better shadows and colours can improve older equipment by checking ReShade screenshots.