I also think it has more to do with style of play being emphasized than just alignment roles/responsibilities.
They are playing an aggressive, get the ball back as fast as possible type of mentality. Where taking risks to get picks, fumbles, strips, etc is of higher priority than making tackles, so we get burned on big plays and give up on avg 30pts a game.
A read & react defense, puts more emphasis on making the other team earn the yards and first downs over and over on sustained drives, to actually score. It uses up a lot of clock, but preventing points is the top priority along with tackling and fundamentals.
Most offenses in the league are not good enough to repeatedly march down the field getting first down after first down, so that style of defense keeps points down and your chances of winning go up.
Playing aggressive is good for teams in a shootout, where the last one to score, or the team with the most opportunities to score, wins the game. If your offense is bad, then you can't play this scheme or you just pile on the losses.