You need someone to run those defensive plays and to be able to use HB Flare on the offensive end, otherwise we'd all play to empty stats and within a certain low-level statistical field. Boredom would set in and people would leave.
If everyone MAN Flat OLB Zone'd all night long Lionel Richie style and/or locked in with that 46 Heavy play and it's all we ever saw....each game would have the same results. Mostly locked down, 1-2 big play hits, low scoring - no pushing boundaries or discovering fun ways to create offense and fun.
I'm being a little vocal to help people out to get more competition....
But, yeah, take a season and if all 16 Games every time I scouted I saw 4343's 2 defensive play approach with set boundaries to what I could accomplish = ZZZZZZZZZZZZZ's.