And if I understand you right, you completely miss the point of the article.

I'm already resorting to tools and workarounds (ie Dark mode reader, invert image extensions, invert colors on phone). But

  - they are workarounds, cumbersome, and don't always work well. 
  - I'm tech-savvy, if you are not and suffer the same condition, you are fucked.

Builtin dark mode on websites and apps would just be net benefit for me for little cost.