If you engage in combat you'll end up swimming is so many weapons that the only waste you'll be doing is deciding whether to throw your durability + fire sword into the canyon or your electric spear into the canyon because you just found an ice sword and you really want to make space for it. I never once asked myself "do I have to waste this weapon" but instead found myself laughing at how absurd it is that a weapon tier I once cherished is now on the chopping block because everything else I've found since then has surpassed it.
The game is designed so that the more combat you engage in, the more weapons you find. Those weapons become stronger & stronger. And if you absolutely, positively cannot live without a specific weapon in your arsenal, the game allows you to drop pins on the map for where specific weapons spawn every blood moon which happens, coincidentally, when you kill more enemies.