Footy fans as a whole are stupid, and I'm no exception. The difference is I accept it and make an effort to understand the things that make no sense. Like how Ricky Stuart and Michael Maguire and Paul Green can be such shit coaches but still win premierships. I've decided coaches are just another of those positions (like elected political leaders) who are in place to give the impression of control over a whole lot of forces they don't actually control.
I'd say styles are worked out also. Players form dips. Great coaches can changes styles and no when it's time to cull.payers and inject new guys into the team
In 2001 I noticed towards end of season sides had slowly worked us out and had become better at stopping us
And players are the same. Why people go on about on about year wonders. Or rookies who flop after a great debut season. A lot of times the players has just had tape on him for everyone to study and shit him down.
Same goes for coaches. No doubt Green was a great coach. But perhaps couldn't change his game plan enough and he let players get stale. Didn't plan for future and signed to many older guys. The whole thing exploded.
I am a believer that you always need youth in your side and juniors mixed with experience. And always need 2 or 3 new additions to top 17 to keep things fresh.