Good point on the spikey/plated/blunt choice. It would be a good idea.
I know why the metal salvage pieces, but they, like stone spirits, are an annoyance. you can sell em, alch em or disassemble em; they have no other purpose in game beyond that. Most people I know don't bother to pick up salvage drops they consider them so useless. I k now why Jagex added them, to take the place of bar, armor, and weapon drops, but at least those had an end market. these don't.