I am not an expert but have some interest and swinging and reading in all of this.
So the double bit was/is the loggers axe, back in the day the single bit was called the farmer’s axe.
Double bits swing better and are far more useful/productive. You would set up one side as razor sharp cutting with a fine and narrow edge. The other side would be set up more blunt for more durability as you would use that side when there was any chance you would dirt/rock the axe finishing the buck or limbing close to the ground. You wanted to keep the sharp side sharp for production and making money.
Loggers with chainsaws use a single bit (typically short and straight handles) because they/we need a side for pounding plastic wedges for felling trees where you want them and may be helping some bucking.
Doubles might be more dangerous and this perception probably has dropped them out of favor. That and hardware store just selling shitty stuff that was never made to do any real work.