I'll agree it's OK to cheat once in a while, once you're in control (and only then), but it's important to call it what it is, cheating.
Confucius — 'The beginning of wisdom is to call things by their proper name.'
I completely reject the notion that type 1s should consider eating any diet they want and simply take more insulin. Avoid taking more insulin than you need, by avoiding ingesting more calories than you need. This is your long-term health, take responsibility for it. Complications don't care if you feel like a victim and keep making the wrong choices in life every time. Make the right decisions (low carb and sugar) as often as possible.
But when you do cheat, call it by its proper name, and don't delude yourself. There is no such thing as an "essential carb", so any negative side effects from larger insulin doses, accumulated over many years (weight gain, hypos), are entirely ones own fault.
There is a difference between knowing the path and walking the path, and sometimes we do fall. But it's also important to look reality in the face and say "I'm taking charge of my health outcome". Eating pizza all the time is not a winning strategy, even for non-diabetics. Be safe and act responsibly, given all the data that low carb diets are better for us, I think it's important to listen to what the studies are saying, and drop the delusions that all food is OK. It's not. That's child-like in its naiveté.