I use a double bit often, an old 4lb Plumb, it's my scoring ax, plus I use if for roughing joinery, it's sort of my daily driver.

It is not my primary felling ax in my hewing, that would be a 5lb Jersey pattern.

To in some way speak to your question, I long ago custom ground the double bit, the cheeks of one bit being much thinner, for when the piece at hand will accept a deep aggressive bite, and still eject a chip with every blow - The other side is left fat for when grabby work wants me stuck.