TBH I think a lot of those losses are dead weight "names" that will be replaced by guys who are fine, we just don't know their names yet. Willis hurts, but no team in the league could have kept him or replaced the value he brought with a QB2. The only name on the list that is a tangible loss imo is Doubs. I've touted Wilson, but you can get a guy like that with roster cut downs. Doubs was consistent last year and became a safety net for Love. Lots of big catches in big moments.
They didn't backfill the WR hole because they have invested in the position and need guys to step up. They didn't get much at all out of Reed or Golden so I consider those the backfills. Watson, Reed, Golden, Williams and Kraft is a very solid group, provided Watson doesn't get hurt because he covers a lot of warts.