I'm fine with this mentality in normal mode. A team full of grey parses can do that content just fine. It won't be super fast, but it can get done without too much trouble provided the players aren't reckless and aren't ludicrously terrible. I'm easy going in normal mode. It's enough for me to clear stuff without difficulty or drama.
I'm not fine with it in ex/savage. If you are parsing grey in those environments you're actually not really clearing the content. Other players are carrying you and clearing it for you. Carrying happens in normal mode too but the burden of doing so in ex/savage is usually significantly higher. It's not fair to put players in this position.