Many of them are just base weapons with extentions, they look good for that purpose.
But with working with clutter items, wouldn't you prefer that they actually look like they were crafted from those parts giving it a scrapped authentic look?
If something is made with wrench, I wanna see that wrench. Unless I can melt glass and metal at proper temperatures, I wanna see those parts on the weapons raw.

weapon mods were very popular in the past games.
I mean, if 3 missiles doesn't stop whatever is coming at ya, you definitely need a bayonet to finish it off with, right?