"Why" is a tricky question. As Doc has said, a large part of training, especially early on, really needs to consist of "Do this" and following directions. For many beginners, the only question they really need to ask for quite a long time amounts to "what did you want me to do?"Maybe that my opinion has something to do with my line of work also. Investigations, analysis, questioning and understanding how things work is part of my life in general. Nobody is the same, nobody learns the same way.
That said, I would never be able to learn from a teacher who basically tells me: "Just do it, don't ask questions", I would never be able to have any faith in him/her.
You're right about the way that modern martial arts are taught. But it's only normal. The teacher is also an employee of the student.
But there's a definite space and need for some understanding of the reasoning behind things, too. That's where some "why" is acceptable. "Why did you step that way?" "Why did you use that technique?" Not "Why do we do this?" Often, the legitimate "whys" will answer themselves, if you follow directions.