What are your other training experiences? Is Front Sight your only training, or do you have another experience you can compare Front Sight to?
I've got no problem with them instilling the habit of a slow, deliberate reholster. That's where accidents happen. No reason to slam it in too fast. But, if that's not your style, then that's fine.
I've just returned from my second trip to Front Sight. I learned a little more this time. Since I was a return student, I didn't have to attend the lectures and got some 1 on 1 time with the range instructors. It was very helpful.
In my critique notes, at the end of the class, I wrote that they didn't stress 'focus on the front sight' enough! Maybe super-duper advanced shooters don't need to be reminded, but I felt like I needed to hear it.
Cut 'em some slack, they're dealing with a variety of shooters and their experience.