vagfilm Now seriously: my main motivation for liking hybrid actions is to have lower up-weight. Constant up-weight may lead to fatigue and injuries. And is counter to nuanced playing.
Mmmm, I fail to see how the escapement helps here. When the hammer (true or simulated) escapes, you have a short moment in which the key is lighter, but that is doing the press down, not press up. FWIW, this is called aftertouch which I find a poor name since it's not happening after, but during the downstroke (moreover it's totally unrelated with the aftertouch of the synths).
After that, the hammer must re-engage with the key on its way down back to pre-strike position (it's the way up for the key). In the case of acoustic grand action this re-engagement is often mediated by the backcheck, unless one is playing pianissimo (in which case it through the whippen only), but in either case the weight goes back on the key.
The only case in which I can see the hammer not weighting on the key during the up-travel of the key is during very fast playing and if the keys/whippens are more lubricated than the hammer flanges. But even in that case, the fingers would move off the key faster than the key goes up, so the upweight is irrelevant? To be clear, this last paragraph is me speculating, perhaps that's exactly what you are talking about and it may be more common than I think.
If instead you are thinking of the commonly said (and true) fact that on a acoustic action the downweight is higher than the upweight, that is due exclusively to the presence of friction and not the escapement: when pressing the key the player needs to push the hammers and overcome friction so the total downweight is something like dw = w + f. On the other hand on the return it's the weight (of hammers, whippen, key etc) that needs to overcome friction so what the player experience uw = w - f. Notice how the difference in sign makes the upweight "lighter" than the downweight. This is important! In fact, part of acoustic action regulation is making sure the friction is "just right": not too much, but not too little either! It's totally possible to make a digital action (even a spring-based one!) with a dramatic difference between upweight and downweight by adjusting friction.
vagfilm burkey Wow, a Portuguese brain surgeon... They don't make them much smarter than that
That is a prejudiced statement if there ever was one
I think he just had some envy for Portuguese nationals, who are seen as very-very smart, artistic and nice and as such admired and felt some jealousy for -- or at least so it is among the non-Portuguese people with whom I had the opportunity to talk about it. Plus, isn't your expertise the topic of a recent Nobel price? So that (admittedly prejudice based, but positive) idea of you based on nationality, with the specialization you have compare to many others….