I give my humble opinion on the matter, where I also agree 100% with Cliff that what we think is not relevant to setting the course for improvements when these are subjective.
The thing is, precisely what each person understands as "IDEAL" is totally subjective. Even more so when we are talking about tastes about sounds and how they affect different musical genres. On the other hand, there is no subjectivity in moving towards greater modeling fidelity.
Additionally, engaging in the "Idealization" of all amplifier models would only lead to them all sounding similar, to the detriment of the diversity of tones provided by the different characteristics and circuits that each of the real equipment has.
We can measure the precision of the modeling compared to the real thing (or at least there are tools to do so). We will never be able to measure the approach to the ideal when there are different ideals for each person in the world.