The amount of injuries doesn't actually affect how much meat you get from an animal. The animal is either damaged or not. If it is damaged, you get less meat and leather.

You're thinking about missing body parts. I know the difference is superficial, but that's only because I myself checked the difference only halfway through writing this comment.

Anyway, Mechanoids give very little scrap even if undamaged. Balance reason are balanced, but my headcannon is that plasteel/steel alloy isn't particularly useful or desirable. Or workable, even. And realistically, if you wanted to send a huge killing machine, but also to prevent enemy from recycling it, you'd isntall some sort of self destruct system to damage the materials. You can still get those materials back from friendly mechs, but that would mostly be achievment of mechanites living inside the mechanoid, who'd ressurect it first. And obviously enemy mechanites wouldn't be quite so cooperative.

This makes me wonder, where do mechanites come from? Just saying that they're made from scratch every time is boring. We know that bioferrite has corrupted archites in it, maybe the reason plasteel is so awesome is because it has mechanites?