I agree overall that our defense has been our biggest issue over the years.
I think the reason people start to look at JG's offensive scheme is because when something isn't working people tend to look into the reasons why. We have a fan base that has pitchforks out ready to take out Dez Bryant, Jason Witten, Dak Prescott all of a sudden. People see Goff and Wentz looking like Tom Brady once they get spread offense with great play design and they see our team look like 11 guys wearing cement shoes who cant get out of their own way and it makes people question. JG has had the luxury of having the smartest QB in nfl history (my opinion) in Romo. Tony and now Dak appear to be scratching, spinning, fighting for every yard the offense gets. Every route is contested. Every play looks like it a millimeter from blowing up and being a loss.
Watching this offense over the years gives one the impression that players have to win their individual matchups for any play to work. We don't see clever play design that creates mismatches and players running free. You don't see the type of plays the eagles ran on us where guys were schemed open. Instead you see men getting pressed and little open field or separation anywhere.
It also doesn't help to have former players like Ed Reed, Ray Lewis ect commenting on how simplistic your offense is.