Splash Mountain had a ton of legitimate AA's filling out its scenes, not just limited motion ones. Especially the finale, which was packed full of ones of this caliber-
These aren't A1000's or even A100's of course, but they still move with great range and fluidity of their own. And there is again a LOT of them. When all of them were present and fully functional, WDW's finale had 17 of these figures and DL had 26.
It would be a substantial downgrade if Tiana replaced these with only a single digit amount of real AA's and filled the extra space with spinning/wobbling props ala Little Mermaid. Regardless of how advanced the new ones are and how many of the extra props there are. Again, not everything has to be as advanced as that Tiana figure, but there does need to be some level of quality consistently in the other figures. Just figures on the same level of those old Splash ones would be perfectly acceptable though and would still blend in well with the newer ones.
Unless those Splash figures were what you meant by "limited motion" figures. What I consider limited motion are all of the spinning/wobbling sea creature props in the Little Mermaid ride (outside of the main character animatronics), which I would again not want a repeat of. At least not as a substitute for what were originally much more elaborate figures in Splash.