The context in which I was writing was the previous comments, not your experience.

Maybe I wasn't clear when I said "you can use MTS" and "support seems widespread".

It's not part of the base MIDI standard, but it is standardized.

https://en.wikipedia.org/wiki/MIDI_tuning_standard

MTS is how you specify how MIDI notes are translated to frequencies, if you desire. You can use it to specify alternative scales, if you desire. The Wikipedia list of hardware and software which supports MTS seems very conservative IMO... my personal experience is that MTS support is reasonably common.

That’s what I said and what I meant. The Venn diagram of disagreement with me congrues with the Venn diagram of self disagreement.