I see a conflict of personal/conversational style here.
That happens.

I've gotten the opportunity to work with a very well seasoned Gunbuilder over this last year and I've seen and handled the product of a blown rifle primer venting into the head of a double rifle stock. It can be really nasty.

It appears as if Mr Vicnair is noting that this kind of thing can happen, especially where dog tooth strikers are present. The employment of gas block disc set strikers and gas vents can help mitigate the danger, but at the end of the day the fellow who converted the rifle might end up being callwd to the carpet to explain himaelf if things ever go wrong.

Personal styles aside, I can add myself to the list of guys here who have seen the aftermath of a double rifle blowing a primer (for whatever cause) and subsequently blowing out the head of the stock.

Not my rifle, btw.