I have to agree with you here. Injuries are part of the game and you hardly expect to have your 15 men in the regular roster available all 82 games. There will be games/minutes lost to injury every season. You only hope that the injuries are not to your main guys or not season ending.
Murray was important to last season's team for sure, but White (who had not been a factor the season prior) emerged a staring caliber player and a very good option last year. I can't quantify him vs. Murray (I'd leave that to the player fans in the site, and the ones who like to stir controversy, bc I personally have never cared about intra-team rivalry tbh).... Anyways, point is, Murray getting injured was a blow, but not a fatal one due to White stepping up.
Rudy Gay is going to be injured every season tbh. He will miss games here and there and will need load management. Not a guy you can play every night for 30 minutes for 80 games a year. They knew that going in, and this season got further depth in both Samanic and Carroll to help out.
What the Spurs got last season in terms of injuries was about average or expected. I do hope their young guys stay healthy next season and we can see them play together to see how they fit next to each other, plus just watch some of the truly new guys in the team develop into rotation players like Walker. There is always the hope that someone of the unknowns has a better season than expected too.
Anyways, I am rambling, but just wanted to agree with you that in terms of injuries the Spurs were average last year. We just aren't going to see the full 15 men remain available for all 82 games.