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In the case of EVs, squeezing out range for every kWh is extremely important. Since range can only be added by increasing battery size (expense), or optimizing aerodynamic shape (practically free), there is huge incentive to optimize the aero shape at the expense of things like ground clearance and utility.
My guess is that Tesla did a great amount of research and tweaking of the design to balance the need for utility, range, and aesthetics and ended up with the Y. In my view, the 3 looks very sharp and is quite efficiently designed. Small tweaks to it seems the right move to me for the Y. For the 2 days a year people need to haul a bigscreen TV or furniture, they can borrow someone else's vehicle.
I don't know what the roof rack options will be, but they are to be avoided anyhow. Hitch mounting is best for many reasons.
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