Agreed, but it's important to remember that the guys they are signing are not that old. Tillery is 28, Greenard 27, Gink 29, Murphy was 25, Griffin 29, Oliver 26, Darnold 27.
These aren't 34 year olds, you can count on these guys for awhile. Obviously, I agree you can't always dump your picks and you can't blow them on bad players, but this is a team that was in a TERRIBLE spot when this FO took over and they've got them at 7-2 with real cornerstones for the forseeable future. And that's despite a really awful first draft.
Having a good coach and good assistants who can scheme and elevate players can cover a lot of roster gaps.