Most likely all shootings have their own “Norm” unto them selves. As far as accuracy is concerned, once law enforcement made the switch from revolvers to pistols their accuracy fell by almost 50% as they used the “Spray n’ Pray” shooting technique.
Also with a revolver you do not need to wonder or second guess yourself as to did you rack the slide, is it on safe or is it ready to go. Those are things that can really screw up a gun fight. My wife and daughter both carry revolvers(.357) because they do not want to have to remember all that goes with a pistol for it to work.
As far as if the perp brings friends, Well Maybe your hypothetical means your screwed.
You can read over and over again in the NRA mag’s where 70 - 88 year old’s are taking on two plus and dropping the home invaders, so if they can do it so should we be able to.
“...once law enforcement made the switch from revolvers to pistols their accuracy fell by almost 50%...”
My son, 8 yrs in the Corps, and now more years as a deputy sheriff, carries a 357 revolver as a duty weapon and beats ‘em all on the range, including reloading. However, if the XD were approved by the department, that would be his choice...in 45 acp.