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Soon as I saw the title I thought their "why" was: so it looks good when I view source.

"why" in the repo, not the HN title

I'd say, it's to optimize for source readability. That's something many of us relied on to learn HTML, and we need to keep that path open.

Not everything in life needs to be optimized.

And not every optimization is worth the effort.

In this case effort was required to remove the optimization.

Nope! We weren't talking about "everything in life" but instead HTML in statically-generated websites.