Yes - Tesla seem to make very big changes under the hood that aren't obvious from outside so you don't realise they're actually refreshing the models. For example at a refresh of the Y they changed it so that the whole floor was battery and the seats etc bolted to that. Massive castings come and go. Pretty huge updates.
What's the benefit to the customer? Usually the silent changes are for making the product cheaper and increasing profits. Did it provide more leg room or battery capacity, or something else?
