I think they’re just sitting on their products, so that they can lose more money.
Sarcasm aside, if GA4 is anything for drum instruments, like HALion 5 is for synthesizers/samplers, it’ll be awesome. Obviously it will use VST3 which means additional features (like native per note modulation). This reminds me… I had been thinking about the drum editor in Cubase. Maybe we’ll see some new cool features? 
If not, then we should, Steinberg! 