While those differences are huge, perhaps the biggest difference is that each Commander deck has a Commander a legendary creature that begins the game in the Command Zone, meaning you can cast it from there
The contents of a fat pack have changed a lot over the years, sometimes several times in a couple of years of revisions
Strategic complexity This is not only fine at common (provided it doesn't have one of the other two types of complexity) but encouraged, as it helps to create depth for the more advanced players
Bouncing a permanent or spell every time you cast another spell is a recipe to get ahead quickly, and the 7/8 attacker helps convert the lead into a win
Balance, on the other hand, I dont think Balance would be okay to print at six mana
Magic is full of artifact creatures and there are lots of other combinations that exist