Regarding the synchronization of POE1 weapon effects to POE2

When the weapon effects of POE1 are synchronized to POE2, can't the GGG development team change it to the logic of POE2 weapon effects? Why do we still have to use only one weapon like POE1 and not share the primary and secondary weapons, Weapon 1 and Weapon 2? I have to buy 4 of them when I need them. Assuming one special effect costs 200 gold coins, buying 4 of them would cost 800 yuan, which is not worth it. Oh my god, this can be done with just a few lines of code. I hope GGG can optimize it