Yeah I completely agree with that but didn't say it so directly. The simple fact is - by using samples of the symphony orchestra, you are one person doing the work of 60 to 80 people. So to expect that instantly to create exactly what you imagine, is not going to happen. Though I'm sure you realize that, that's just putting it more extremely. On the other hand, it is pretty astounding what you can hear simply pushing a few keys with VSL sounds. Translating that into an entire piece of music though does take a lot of work. Though once one finds a system of one's own, it becomes something you are used to and can develope some real facility with. i also have the same feeling as maestro in that after doing all the MIDI and sample tweaking, then comes the mixing which is another entire world of technique. But still it is exciting to get music to that stage and start working on it.
One thing I did not put so clearly is the idea that with the approach of a matrix or preset of your own, you can start with the minimum of what you need. And you find that you can do a HUGE amount of music with just legato, sustain, portato/detache and staccato. Many lines of music require nothing more than those. So setting up matrices that use the minimum, and then expanding as more articulations are needed, simplifies the task enormously.