Off screen, I never heard any groundswell of "it's so unreal" when Torres took over. Like most things, it's more about whose making the decisions than the actual decisions made.
I think Geordi's promotion, while odd, was less of a stretch because he also has years of experience in both engineering and command. He was rather low rank considering we saw 3 engineers of lt-commander rank in season one but he wasn't an ensign.
Chekov is an inexperienced talented engineer who has spent 9 months working in a different department and only spent a few months shadowing the chief engineer. There should be maybe 2 more assistant chiefs in the department (one for each shift?) who will be higher rank than Chekov. Promote him to engineering by all means but making him the chief was lunacy. Steady as she goes Mister Mo.
It is true that you do not need your best engineer as chief - you need a good leader, good organiser, good delegater, someone who knows the talents of the staff in his/her department, and someone with rank. Chekov aint all those things.
It was a fun tongue-in-cheek moment but it was bonkers and it would have played out the same if he was just assigned to engineering as a bridge liaison.