The car buff in me much prefers model years for cosmetic/style change reasons e.g. being able to look at a car and say, that's a 2006 or that’s a 2010-2012 or that the first year for the new style XYZ model was 2015, etc. I think a reason manufacturers use model years is because they don't want to be strictly limited to major redesigns being released on/around January 1st and still recognize the advantages of at least redesigns following a 'year' to 'year' identifier. If a manufacturer releases a significant redesign mid-year, they will have two very different looking cars identified by the exact same year. At a minimum, that can complicate things like future valuations (discussed in a separate thread here: KBB, NADA, Edmunds and valuing Teslas). Since model years don't prevent manufacturers from adding, removing or upgrading options/features/components during that year, I don't really see an advantage for using the calendar year to 'label' a car as Tesla does. Tesla wanting to be different is fine unless it's simply for the sake of being different with little or no advantage, or worse.....potential disadvantages. What am I missing?