Bruno Putzey used discrete buffer stage for NC400 DIY modules, with which I built my first NCore amplifier back when they first released, cost was up there but it certainly made me listen, and way before I joined Nord.Speaking with a forum member, I have *somewhat* reevaluated my stance on discrete opamps and admit they can make sense in certain situations. Putzeys seems to agree with this too. His rationale makes sense, albeit he is speaking about bespoke opamps designed by Purifi for a specific application in a specific circuit:
Discrete Op Amps: When and Why It Actually Matters
purifi-audio.com