Here is a suggestion for a future version of Cubase.
It would be interesting for the Cubase team to redesign a new graphical interface for the Prologue, Spector & Mystic plugins and why not create a VST that would allow to combine the sounds and characteristics of these three synths in a single module, no way here to abandon these three VSTs .
In summary, creating a kind of rack (VST) to mix these synths could offer new sound possibilities and give a second breath of life to them. Some will say that we can already make this kind of rack using three instruments tracks and fiddling to get something interesting, but a VST rack dedicated to this task with the addition of features like a sequencer , flexphrase, ability to attach samples, an integrated chord track, some effects and other facilities could push much further the limits of these three synths.
The three synths already exist, being able to combine them by adding features would be a way to create a new VST without much investment in my opinion. Put them in a rack. The PSM, SPM, MSP Rack. It does not matter the name.
What does the Cubase community think?