- In dungeons and other party content a full beast transformation would probably impact personal movement speed because of coherence between animation and travel distance (like with the pomands in PotD, and HoH). Bard doesn't give movement-boost in-combat, and ninja is the only one with higher movement speed. Not sure how this would impact party dynamics.
- Full transformation could obstruct field of view, and the whole thing with Demi-Bahamut occupying most of the screen space used to be an issue.
- Transformation in-combat could be laggy, and have to have cast-time since the server and pc-s/consoles need to load/register the correct position of the new model. Some people may then complain they can't do clipping and sliding while doing mechanics since all models to be used for quick transformation would have to be in memory and ready for use. This could impact performance, as I know my laptop (at least) stutter during some raids with large bosses and many effects (mostly The Royal City of Rabanastre). The PoTD and HoH are hallways, and not that resource intensive compared to raids and more open areas.
- I can imagine some people would look at the Pomander of Rage and complain that their transformation isn't as powerful as that. Same with the potential of turning into a Red Chocobo.
- Lorewise I'm not sure how someone would differentiate between a Trickster Imp/voidsent and a player, but that could probably be sidestepped/ignored.
The core aspect of Morpher seem interesting, using souls in place of beast material. It would open up many more possibilities, but also limit the content we could do with it, like you said. If they can implement that mix of limited and normal jobs I could see it maybe working somehow. In FFXIV it may creep into other jobs' lore too, though it could be a nice opportunity to expand on the lore of soul crystals, maybe?
Sorry if I sound negative ^^; Glad you liked the aspect duality thing
