Hi fahl,
I agree with you that the ultimate test of any performance is whether or not it convincingly communicates the musical idea to the listener.
Likewise, I agree that a fine pianist's performances can be highly creditable or not-so good. There are many factors that can come into play--unfavorable biorhythms, fatigue, loss of concentration, nervousness, distractions such as audience noise, an unsatisfactory piano, a memory lapse, and other things that can cause an "off day" during a performance. Nontheless, many artists have overcome daunting problems to turn in splendid performances as you suggest. Is this all a matter of chance? No! It has been conclusively proven over and over again, that the key to consistent success in performance is preparation. That is, if the pianist has engaged in thorough, intelligent, analytical, thoughtful, musical, efficient and effective practicing, then the odds of a poor performance are vastly reduced. Why? Because he truly knows the score(s) and how to execute them!
Turning to your endeavor, I cannot comment on the demands of the process of making electronic realizations of piano works, nor can I compare them to what I just described above, as I do not know enough about it. The process can obviously produce a seemingly flawless realization, but it is not necessarily as exciting and gripping as an artistic performance in my humble opinion.
To clarify, I never called you a monkey. I did mention the brass monkey, which is merely a figure of speech. If I offended you, then I apologize.
Getting back to the "demands" of making your realizations, perhaps you could illuminate those for us so that we have a better appreciation.
By way of contrast, I can certainly mention here the standards of pianism. At the fundamental level, the concerns center on such things as accuracy, tone quality, technique, rhythm, phrasing, dynamics, balancing of the hands, observing structural design, clearness of linear voices, nuances, timing and spending of climaxes, imagination, and more. At an advanced level there are other standards including things such as knowing performance practices, following voice leading, voicing or coloring a horizontal melodic line embedded in vertical chords, emulating the singing human voice in cantabile lines, matching dynamics between phrase endings and phrase beginnings, distinguishing between foreground and background, understanding of stylistic periods along with the composers therein, being able to justify any execution of figuration based on analysis of the score, developing integrating and synthesizing motions as part of technique and choreography of the hands, playing strategic harmonies, etching the long line, and more. The accomplished pianist also comes to read between the lines of the score to better know the composer and his intents. All of this is imparted from the artist-teacher to the student, traditions that are handed down through the generations.
I respect you and your exploration of technology. Do I believe that electronic realization is as good and desirable as a fine acoustic piano rendition? To be honest, not really, in light of all the standards I just finished mentioning above about piano performance. While making electronic realizations is undoubtedly an exacting and difficult endeavor, I cannot equate it with the art of piano and the artistry required of the musician which I see as being at a more lofty and noble level. It takes many years of training for anyone to become an accomplished pianist. Learning the software and how to apply it certainly must have its own learning curve, but probably does not take 10 or more years to grasp and to use it well.
I can visualize electronic realizations having a place in some modern avant garde music, in music used in commercial advertising, a library where one could easily access a piece to get an overview of it, and maybe in music appreciation classes in public school systems. There are probably more applications, but these come quickly to mind. But I don't see it as being fully comparable to artistry in the area of the serious repertoire for the piano.
If suddenly the world ran out of wood such that acoustic pianos could no longer be built, maybe the electronic realizations would have their day in the sun. Hopefully I would be long gone by then.

But until that time, I believe the piano, its amazing and inspiring literature, and the great performers and pedagogues will continue to strongly predominate as they should.
David