No, the vehicle we are looking for is a 5 door. The "three box" sedan design is inferior, and this vertical trunk hole appears particularly inferior.
Yea, and five door barely exists in this segment.
And those that do, tend not to have gorgeous, spacious long glass roofs like the Model 3.
They've chosen a design direction for the M3 just like they did the MX. Whether you like it or not, that's the direction they're going.
The Model S is your big, bulky, plywood-hauling vehicle. The Model 3 and Model X are more practical people movers, and their cargo capabilities reflect being good people movers.
With shorter wheelbases you tend to get hatchbacks or notchbacks, this isn't some sort of Tesla oddity but a practical design decision well-established by the automotive industry. Having good rear headroom with a liftback of a short wheelbase just doesn't tend to be possible.