Even if they only added the ability to select different groups of Phrases. Perhap even by loading a different firmware. Then you might have a Hydrasynth Dark, and a Hydrasynth Pop, and a Hydrasynth Standard editions. But yeah having a way to create and load your own Phrases, would be great and has got to be a frequent request.
Funny, but the Phrases feature is a little like something on a “Keyboard Arranger”. If the HS was multitimbral, Phrases might be the backup fill, with drums, bass and rhythm parts. I almost imagine it coming from a trimmed down and disguised piece of Medeli Keyboard Arranger code.
But then “Keyboard Arrangers” carries such a stigma with many synth users. Just forget i drew any comparisons.