I’ll argue this: Murphy and Hughes are not terrible. Hughes, in particular, has not been setting the edge, but Murphy has (oh, how the tables have turned!).
Phillips has been better than good, so has...one of the new guys...Addison (?). Milano is very good and so is Edmunds when he’s not injured. That makes your argument a challenge, from my point of view.
Ok, not enough depth? I’ll buy that. But with the general slant of the NFL towards O, I’d expect this to go on. What that means for future draft picks, etc. is another discussion.