@awnlee jawking
One thing people who don't understand the game don't realize is that football at a high level is an extremely complicated game
That's something I've noticed about American versions of sports - they love to introduce shedloads of complexity. It's evident if you compare baseball to rounders, or American football to rugby. Unfortunately the disease is now attacking cricket, with all sorts of wheezes to try to make a sedate, slow-moving game seem more exciting.
I think these are two different sorts of complexity (really, three). I'm not disagreeing with what AJ is seeing here, mind you. There are often rules put in to 'speed up' games, keep things moving, and so forth. In football in particular, there's a tension between 'keep it moving' and 'keep it safe' that's never going to be fully resolved.
Another level is to create excitement elsewhere. If you go to an American baseball game, for instance (especially minor league), there are many, many other things to do besides watch the players play baseball. There are all sorts of distractions both virtual (all sorts of things on the scoreboard, from mini-games to crowd cameras to advertisements) and physical (mini-golf, play areas for kids, climbing walls, and on and on).
But the original comment wasn't based on any of that, I don't think. I'm pretty sure that DDActive's point was about the game itself, and it's fundamental to the game, not an embellishment or added complexity.
American Football (not at all exclusively; most sports have this to one extent or another) is based around designed 'plays'. The complexity comes in with getting (for your typical offensive play) five very large guys on the line to move precisely in unison while making it as hard as possible for the other team to determine how they are going to move. As they're doing that, receivers need to go to specific spots on the field and/or block defenders, the quarterback needs to move in a certain way to be in the right place to be protected, one or two runners might need to move in specific ways, and so forth.
The whole thing is very much like a complicated choreographic routine in a show. Footwork, body position, hand position, even the nuances of how one holds their head and where there eyes are focused matters. The other team is doing everything possible to figure out how someone is going to move before they do it, after all.
That points to the next layer: once you have that 'dance routine' down, you need more. If you just have one or two, the other team knows what you're doing. So, from the same exact initial position, there need to be several very different things the team can do (still all in unison).
And you need a quick way of telling everyone which one you're using, and that has to be something the other team can't overhear, decode, and use against you.
That's inherent to the game. It's not 'introduced', it's just part of putting 11 highly trained, highly compensated people on a field, opposed by 11 other highly trained, highly compensated people, and having them execute at the highest possible level. If you're not making it extremely complicated, you're giving the other team a big advantage because they will know what you're likely to do and you won't have any idea what they're going to do.
The nature of American football lends itself to that. Faster, more fluid games (non-American football/soccer, hockey, basketball, etc) have plays, but very rarely does everyone (except perhaps one player) stand stock still in a particular place for five or ten seconds while the other team mostly stands still, too, while both try to figure each other out. American football, with its run a play - stop - run a play - stop format, lends itself to that sort of structure.