I hope Roland is running the same code on the Boutiques as well as in Roland Cloud on PCs. Not only would that save Roland money, but it ensures the code is very well tested. Probably not literally a VST, but conceptually similar.
VST in a box that has a the right buttons and sliders is a good thing.
Just like synths being toy-like (fun generators of ideas and sound) is a plus.
Anyone who uses “VST in a box” or “that synth is a toy” disparagingly is exposing their own limited horizons. 
That said, the SE-02 is the only one that isn’t a VST in a box, but it is a toy