Eli5 why are combat units “ineffective” after taking 15% losses?

Question

Eli5 why are combat units “ineffective” after taking 15% losses?

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Answer 1

I’m not an expert on the matter but I’d imagine it would be similar to your body.

Your body is effective as long as every system works normally. If I take 15% of your body either in one big chunk or bits here and there it’s going to knock you out and take you out of action. You are out of commission.