When it sounds so real you can hear the rosin falling off the strings and the bow on the fiddle..... that's all I want. Nothing more, nothing less. Since I don't have the time to learn the fiddle.....I use synths.
Sampled or real.... doesn't matter. If it sounds real, then that's all one could ask for.
Hasn't that been the goal pushing midi all along? To get the synth sounds as real and as close to the original as possible....? Why else would they use all those controllers for attack and decay and velocity if it wasn't to try to imitate as closely as possible the sound of the Rhodes or the trumpet or the violin?
I do believe they are getting really close with some of the products on the market.... give them another 5 to 10 years..... the progress will be amazing.
Despite all that,,, yes, it is still a noble and worthy pursuit to learn and master the playing of real instruments. I am still pursuing that goal with the guitar, the keyboards and most recently I have added a mandolin to that line up of things to learn to play well.
The modern musician can be someone with nothing but samples and loops nothing but artificial intelligence software synths, nothing but real instruments or some combination of all of them. If the result is pleasing to the ear and to the soul... it is music regardless of how it was created. Music, after all, like art, comes form the soul of the person, not a bunch of hardware and software.