Why is it difficult to consider that guys is not the plural of guy? Or that girl is not a perfect analog of boy? I understand the logic of "it's not how you m

Why is it difficult to consider that guys is not the plural of guy? Or that girl is not a perfect analog of boy? I understand the logic of "it's not how you mean it but rather how I take it" but at some point people are going to start to think this isn't how you take but some sort of ideological power play.