Agreed. Aside from assisting in removing bias from the reader, working your way through to the conclusion allows it to remain a mystery to the reader, allowing them to enjoy being walked through the process of discovery, rather than just giving them an answer, then doing a "here's how we got there", which (in some cases) becomes less interesting once the answer is known.

To respond to Fusiongyro's point that this is a narrow view I point out that generally in writing style should change with context. In some cases the author of the article is exactly right about summing things up in the first sentence, in others johnfn is.

TLDR: Whether to use tldr depends on what experience you're looking to give your readers, what you're writing about, and who you're writing for.