Wow. As a pretty heavy user of the Kontakt sampler, that's sad to hear. I've gotten so much mileage out of libraries like Analog Dreams and The Gentleman...
But also, yeah, NI is to music what... VS Code is to devs, right? Everyone uses/makes Kontakt libraries at some point.
IMO that would be Ableton Live. I have the MK3 finger drum and was thinking about buying a keyboard controller next. This makes me sad.