Well everyone has their own opinion but there are also facts and the facts are they don't (and are not designed to) open on contact.
Its not failing that is the problem. The design is the problem.
Ive heard the same thing over and over again and it always ends the same.
I believe you haven't had any problems but you eventually will. How many mature (250lb) bucks have you shot with them? They leave a 1inch single cut on entrance...If you don't get through(and eventually you won't) or guts plug the hole that is a huge problem.
Just give what I'm saying some thought.
It is not an opinion that they leave 1inch entrance holes and are prone to lack of penetration...those are facts not opinions...Just give it some thought.