Don't know if this is the right place to say, but I think the concept of switching weapons every time you get a new one is really irritating and unfun. Sure, it makes the game slightly more strategic, but mainly it just takes the enjoyment out of getting stronger and progressing. I really wish they were upgrades instead of complete weapon changes or you could switch weapons in the item bag
As you said, I believe this mechanic offers more strategic depth:
-the bonuses (attack and accuracy) you get for weapons are permanent and stay even if you change weapons
-having to switch weapons creates a perfect risk/reward situation: is it worth getting a new effect or higher attack in exchange for losing some accuracy or maybe an interesting effect?
That said, I find the idea of weapon switching interesting, and I'm sorry you found it frustrating. Thank you for your feedback!