Temporarily retiring weapons for seasons is a good thing.
It creates new meta, forces you to try new things, and resolves power creep.
In YuGiOh (for tournaments), certain cards are way too powerful so they limit them or ban them outright for a few months. This forces players to think outside the box when building a deck. Every few months or so the banlist is revisited and revised. Some cards are brought back into the meta while others get benched for a while.
For casual play you can use any cards you want. so think of non pinnacle activities as casual play, your weapons are still there to use when ever you want! But if you want to do high power raids or trials then youre going to need to set down your go to weapons and actually have to think about what you are going to bring into the fight.
Power creep is fun until everyone is using spare rations, erentil, mind benders etc.
Time to shake things up.
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I think weapon retirement is totally a good idea on paper. But in destiny the RNG is so bad that with the amount of sheer time people spend grinding seemingless endlessly for certain weapons with certain rolls, it makes people feel like they are wasting their time. It took me 30 last wish runs to get a snapshot supremacy. I spent 20 hours in the hollowed lair for a mindbenders and I never even got a perfect roll. I took me a YEAR and a month doing dreaming city milestones every single week on every character to get the curated twilight oath. In that time I never got a retold tale with quickdraw and full choke btw. And I have lost track of how much time Ive spent in reckoning grinding for spare rations, still having had yet to get a well rolled one. And I consider those to just be the essentials. There are people who are after god rolls on every single weapon. When you put that much of your time into something, it is incredibly discouraging to hear that eventually your rewards for your time will expire. If RNG was less forgiving and every gear farming vessel was similar to menagerie and forges, where you pick your reward and have a consistent way of obtaining it, I would absolutely welcome weapon retirement. But menagerie and forges are anomalies.