Yea I don't immediately infuse any weapon. But for an example, with Iron Banner, the last go around I cycled between Last Extremity, Lymuidia, and ToM as my primaries. With my Havoc Pigeon as my special. Since then I now have No Time to Explain, Nirwen's Mercy Zhalo Supercell, and Ironwreth, all which are weapons I am going to want to be able to use in the future Iron Banners or trials. So they all need to be upgraded and eventually infused, and I barely had enough parts to unlock all their perks.