Do you realize that the final four teams last season were the top 4 scoring teams in the NFL?
With the way the rules of the NFL are changing, you need to have a really good offense that can score. The team you’re describing was basically the Chicago Bears last season.
The rules... The rules, they are so geared toward offense now, the game is so different and high scoring that defense is meaningless, it's all offense now everyone! Or so the myth goes...
People have been saying that every year for the better part of two decades and yet that myth keeps getting busted, mostly because the rules changes are pretty subtle when compared in context and defenses are able to easily adapt.
Did you know back in the "no holds barred" 80s, when lore said defense was everything and you could grind out a championship off 0-6 wins each week... Well they actually had a pretty productive offense back then too.
Back in the 80s then a team averaged 21 pts per game, with the lowest single year avg of 20.2 PPG.
So fast forward to 2008 to 2018 era with these terribly restrictive rules that favor offense what are we avg now... 30 pts? It's a different game now remember, it must be huge.
No... These last ten years have produced an avg of 22.4 PPG... A net increase of 6% from the 80s. The game hasn't changed as much as people like to pretend. Player safety and keeping QBs healthy has changed a lot since then. Pass coverage has to be cleaner for both defender and receiver, but it's still 94% the same game as it was 40 years ago in terms of offensive output.
2018 was the highest ever year thanks to KC lighting it up but still just 23.3 PPG avg. 2017 was just 21.7 PPG, right there with the 80s.
You may have missed the part where the difference between the super bowl champs and the lowly Giants was just a FG. Avg possession per game is about 12. Pat's scored right about 2pt per possession. You can be an average O team with a great D and stop 1.5 of those more than the avg and your avg O can beat the Pats.
Btw, KC avg like 35 PPG last year... I didn't see them in the super bowl. I also didn't see that Rams offense do much, or Pats offense for that matter when they won the Lombardi 13 to 3. Seemed like the defenses on both sides played a bigger role than the offenses.
TLDR; stats don't lie. Defensive is still as important, if not more so than your Offense.