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As for Max and MSP objects, most of which were developed before the Jitter "division of labor" was introduced, it would require a pretty major effort to retrofit existing objects with the "core object"/"Max wrapper" split of functionality.
This is just the view from outside the ranch, I don't know if any of the devs inside Cycling wants to say more about this.
One could argue that it would make more sense to have the Litter Power objects in JS than the standard Max objects: they do very specific stuff whereas Max's plus object is very similar to js's plus ;-)