I used to own a Shiren PE-10 custom and while that never blew up, it simply folded away once loaded up. It had a really horrible action and I was fortunate to get rid of it. I think I know which PE6-8 you are talking about as well - is it a kind of noodle? Perhaps this mismatch of drag rating and line class could be one of the reasons for blowing up.
I must admit I'm extrapolating the experience of the Shirens to their popping range - I've probably only come across a BOSS rod only once or twice. But after the experience with their jigging rods, its hard to have faith when they could get a product so wrong! Of course, if anyone would like to take the risk and stray outside the 'tried and proven' box and purchase a custom BOSS.... well, buyer beware, especially when there are so many tried and tested rods on the market like RF, Carpenter and Smith.
Anyway, maybe someone should try one to prove it a misconception. Brandon, there's something in your collection that hasn't been filled yet
(It could go next to your Southern Deep Ultimate Monster)