I think the first gun should be upgradeable to exotic like the husk of the pit. There isn't any modern day weapons and the first gun has a pretty cool design but you only use the gun for the first level then its gone forever. Hopefully I'm not the only one who thinks this.
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I think all guns should be upgradable. Find a weapon with decent stats regardless if it's white/green/blue/purple. And with each upgrade after a certain point let it be up to RNG on what perks you get with it. I clearly understand the massive amount of flaws with this concept, but I've always thought that would be a neat idea.