I’m not trying to be difficult but you aren’t addressing my point again. I understand the idea of dominating an environment. I just happen to think that clearing as much of a room as you can from the threshold allows you to dominate the room more than entering it with no knowledge of what you might find inside. “Dominate your environment” is one of those things that sounds great to say but isn’t really a plan, it’s an end-goal. It’s like when people tell you to “just stand up” if you find yourself grappling with someone on the ground. It’s not that easy when you’re confronted with opposition that doesn’t want you to “just stand up” or “dominate your environment.”
Your main concern with pieing seems to be that you’re setting yourself up to take rounds through walls and door frames. My concern with dynamic entry is that you may be setting yourself up to be in a position of great disadvantage with very little time to respond to your newfound circumstances which could lead to multiple crappy options. One of those is you ducking back out of the room and taking rounds through walls and door frames. Another one is you being stuck in a room and absorbing a lot of incoming rounds. Several people have already mentioned that the trend towards pieing prior to room entry didn’t come from Sims scenarios. It came from dudes in Iraq and Afghanistan dynamically entering rooms and suddenly finding themselves face to face with a machine gun emplacement that they would have been able to see prior to entry had they tried to clear the room from outside first.