About that golden ratio, it actually means that all floor-standers are completely out of proportion and a good ratio speaker will be ~ 35cm, 17cm, 25cm. let's say the baffle width is 35cm, it means that either the height or the depth should be 17cm which both are a big (small) problem. I don't remember seeing such a speaker.
True. But then again, if you make the shape of the enclosure void optimal in proportions, that's just one of many things that affects the backward radiated energy of the drivers. The shape mostly just makes other countermeasures less crucial, assuming they are even needed in the first place.
In the case of being restricted to a box, the best shape for both speaker internals and listening rooms would be a golden trapagon. But that's just not very practical, and the penalty you get from making the shape "subpar" is hardly ever substantial enough to make it worth the effort.
Besides, backwave coloration is probably a big part of what gives a lot of speakers their "personality".