Boy was the start a mirage?

What I want to know is how the Saints are always the team getting depleted by injuries to key starters. When I look around the league, other teams have injuries but rarely is it a slew of the guys they can't live without. The only teams in the league missing as many vital players as the Saints are the 1-3 Rams and 1-2 49ers. The Rams and 49ers have stayed healthy by NFL standards for awhile, but this season it seems the scales are trying to balance it out.

Going into today's game without McCoy and Ruiz, then losing Hill again while Olave and Kamara play through injuries... just surreal. Like, how??? It is only week four! How is almost half the starting offense already hurt?
Some of it is boring things like being a team that plays primarily on field turf.

Some of it is a draft and free agency strategy where the team attempts to rehabilitate injury prone players in an effort to pay less.

Some of it is a financial strategy that always leaves the team having to move massive amounts of money around to get under the cap and not able to keep players who could provide quality depth.