If you are trying to field the best team you can under the cap wouldn't overpaying for an aging vet's production, be an obstacle to that?
yes, we pay the QBs very little so that should equate to having more room to spend on other solid starting players (say a C or WR or RT), but if you overpay a vet for past production, you negate the benefit of those cheap QB contracts.
Everything move/contract plays a part in forming the best roster possible.
You simply can't field the best team possible, even with cheap QBs, if you are massively overpaying another player for past production. Maybe the D wouldn't look like hot garbage without Cam (as you say) if he were to take that haircut and bring in a solid rotational DL behind him to give him a breather since he is a bit long in the tooth say something like 15-16 million (which is more than fair) then allocate 6-7 million more to his backup. We could probably land a pretty solid rotational DL with that coin.