[nytpu]

Almost like those existing env vars made it clear that they were mistakes that make behavior inconsistent (especially libcurl) and they want to avoid repeating it with additional env vars. Having almost contributed to Curl before, they repeatedly note for contributors that just because old code does something questionable doesn't mean your new code is allowed to do it—if anything, you're just highlighting the questionable piece of old code as being important for them to rewrite soon (of course they can't remove the current env vars for compatibility reasons).

And the article specifically notes that the current solution doesn't work, but it requires discussion on what the best solution is instead of just taking the literal first solution suggested by someone.