Chancha's comment about the tapering of the 2016 design is true - the taper does make it easier to slide into slim shoulder bags etc. It's been my experience too. The worth of that slight convenience is more valuable to some than to others.
I think that Apple did loose an opportunity with the old design. The could have left a large battery in it - 99 watts, put in a 15" mini LCD screen, and an M1 processor, and left the rest alone. No fast charge magnetic charge port, the same old 4 x type C ports, no photo slot, just leave it at that. If I was Apple, I would have dropped one USB-C slot and put in a old type 2 USB slot - but the excuse back then in 2016 was that the case was too thin for the old USB port. I guess it would still be too thin for an old USB slot, bit I've always missed the old USB slot.
So .... have a super long battery life 15" computer, that looks thin. And for many, the m1 is plenty fast enough.
Apple's range would then provide: 13" M1, 14" Pro/Max thicker very powerful expensive, 15" M1 long battery life slim more mobile but not Pro orientated, 16.2" full bottle.