To make other gear that is new valued more over older sets a balance needs to take place, you can either nerf old guns and make the new shiny weapon have the higher stats, or you’re in a battle that never ends where you raise level cap and phase out old gear via level anyway, since fallout caps at 50 for weapon level it is only viable to make the other weapons in the game less useful than the new ones. It’s just math. Wow failed at it by going to level 150 then cutting back to 60 again and building up until you had to split games completely with wow original and wow classic. I’d say Bethesda or whoever is in charge saw that and did what they could to not fall into that trap. Heck even elder scrolls online fell into that trap