Appeal to tradition bias?

Yes. Turns out languages work by saying things the same way somebody else said them before.

My point isn’t that there can’t be a reason to change. My point is calling ‘he’ out as implying misogyny on the part of the author is ridiculous, and fussing over changing it is, in this situation, in my opinion, petty.

So is singular ‘they’.

Indeed. Some English contexts are used to defaulting to ‘he’ for ungendered animate; some to ‘they’. Neither necessitates an egregious humanitarian wrong.

The rest of your post is just a slippery slope argument.

I did get facetious toward the end. If you like, you don’t have to build your life philosophy on the foundation of the logical integrity of my closing paragraph. Up to you.