At FL350, as the boys wrote, it might dive you into a highspeed stall, intervene with traffic below. You have people walking, trolleys loose, hot drinks being served, and you would risk the jerk of a sudden intercept? Quite dangerous, I'd say.
If that were the case it would be a "guarded" switch or require a confirmation press after the initial. I have seen it pressed accidentally as the result of a slip of the hand in turb.