I didn't say "every little bit helps". "80/20" absolutely can't be applied to "almost everything" and assuming it can is lazy thinking. Even if it does apply

I didn't say "every little bit helps". "80/20" absolutely can't be applied to "almost everything" and assuming it can is lazy thinking. Even if it does apply in this case, just because as secondary cause has 1/4 impact, that doesn't mean you should ignore it. Sometimes secondary causes have cost effective solutions that mean it is more efficient to address first. Simply ignoring this possibility like you are suggesting is not smart.