The Rams defense is actually pretty good. Their "blind spot" IMO, is when they play the whiners. Rat girl is completely happy to take 3, 4, 5 yards on every play (because the Rams don't adjust) and wind up with 15 plays drives for a TD with the longest play being 9 yards (I'm speaking rhetorically). And they don't seem to adjust so the whiners have no reason to change. And as a fan, it's frustrating to watch.
It seems like Purdy is good at that dink and dunk game (and it's by design to prevent the Rams defensive front from sacking purdy). Take away that short middle and force Purdy to make longer arm strength types of throws. Yes, he can make them, but those plays need more time to develop and pressure might affect the throws. I'm no defensive guru, but I don't think I'm way off the mark here?
And for the record, not that it matters, I played football growing up. Offensive and defensive tackle in middle school (and all special teams) and defensive back and running back in high school and some special teams. Not that minor league football is the NFL, but I have been on the field and understand some of the concepts. Punt coverage for example, is about "owning" the lane you are covering. Big returns happen when someone gets exploited instead of covering their assigned area. At least that's what I was taught in middle school and played special teams.