I respectfully DISAGREE!
Not all firearms are heavy barreled bench guns.
I have a few VERY LIGHT bolt rifles built for hunting. They will never have a need for 5 consecutive shots!!! With them, If I can make consistent acceptable ONE to THREE shot groups to my POA, Im elated and consider them useful accurate.
Remember these are hunting rifles and with these rifles, I want a COLD bore shot dead on my POA every time. I don't care much for what the 5th shots impact is, cause I simply will never send it.
By 3 shots, the light barrel in some calibers, can be quite warm. Warmer then Im comfortable continuing shooting.
"Your in the know" we all know this. But I read of too many, who are know use this "5 shots or its useless" as a put down, to shooters. Many times because they read of knowledgeable fellows, such as your self, making such blanket statement's.
CW