Both Hermode and Situator (the one more automatic, the other more customizable and flexible) would be a great addition to our toolbox. However, our tools can't connect. Logic and Cubase both support Hermode tuning. If I'm not wrong, Cubase pretends that the sound player understands VST2 Detune commands. Dorico does the same with its custom scales (and doesn't support Hermode).
Kontakt and the VSL players do not understand, as far as I can see, VST Detune commands. So, the fact that the sequencer/notation program can send these tuning commands is useless. I think only HALion and NotePerformer can understand these commands.
Supporting custom tuning would not be a matter of responding to a niche request, but simply to make even a simple brass chorale sound better.
Paolo