Tires E-350/450: Stock 225/75? Tall 215/85? Wide 235/85?

Grit dog wrote:
Just buy some new tires.
No advantage going larger or wider unless you need greater weight capacity.

Just throwing this back out there. Appreciate the dissertation on tires, but why?
And why would one intentionally use tires (225-75-16C) that are far less popular and less available than all the applicable comparable tires that are commonplace and can be found at any tire shop virtually anywhere in North America?