You're stating that the perks make up for the difference in capability between a fully modded off spec weapon and an on spec weapon 2-3 quality levels lower, or more, and that excluding weapons you're specced into from quest rewards and, iirc, trader loot won't result in a long lasting capability disparity between the two. I'm saying, and I think @Uncle Al likely agrees, that I doubt you're correct.
Even if you are correct, what is a player going to reference to be-able to accurately tell that without having to break out a pen & paper or a calculator while flipping through multiple tabs in game while eating the time to the next Blood Moon or gamestage threshold (noticeable when the zombies get harder)?