Hello CK - I certainly agree the example is to the extreme and it doesn't conventionally represent what 2 guitarists would play together as a harmony.
You also hit the nail on the head by saying coming out of the same amp.
I too agree your harmonizer approach is superior to most products overall but I've been saying for a while now there are only a few more things to do to
make it even more realistic.
If you could please add a user controllable delay for each harmonized voice and a user controllable modulation effect for each harmonized voice PLUS a filter/EQ for each harmonized voice.
The delay amount doesn't need to be a second or anywhere near that.I'm thinking a 1ms - 150ms delay at most for each harmonized note.
As you can appreciate two guitarists never have the same tone/EQ as the other and they are never perfectly in time and in tune with each other so having the above control could somewhat
simulate two guitarists far better than what is on offer at the moment. Some of the best twin guitar harmony sounds would be from Thin Lizzy and a common approach by them was one guitarist
was on the bridge pickup whilst the other was on the neck pickup. This is why the EQ option is required on the harmonized voice to try and simulate that + even when both were on the same pickup
their amp settings and touch are always different.
I have an Eventide H8000A and the above control exists in it, however, your tracking/algos etc.. are superior. If the above was implemented you would be leading the industry and satisfying
your users with world's best practice.