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Google vs W3Schools HTML Style Guide (exclude optional tag)

I read several style guides and saw conflicting recommendations regarding optional tags.

Google says:

Omit optional tags (optional). To optimize file size and for tracking purposes, consider excluding additional tags. The HTML5 specification defines which tags may be omitted.

(This approach may require establishing a grace period as wider since it differs significantly from what web developers usually teach. For convenience and simplicity, it has canceled all optional tags, not just the choice.)

W3CSchools says:

Close all HTML elements In HTML5, you do not need to close all elements (for example, an element <p>).

We recommend that you close all HTML elements:

and

We do not recommend excluding <html> and <body>.

This means that Google prefers:

<!-- Recommended -->
<!DOCTYPE html>
<title>Saving money, saving bytes</title>
<p>Qed.

W3CSchools prefers:

<!DOCTYPE html>
<html>
<title>Page Title</title>

<body>
  <h1>This is a heading</h1>
  <p>This is a paragraph.</p>
</body>

</html>

also considered "bad looking" to write this, whereas Google would recommend it.

<section>
  <p>This is a paragraph.
  <p>This is a paragraph.
</section>

I was very interested in what W3CSchools matters with regard to the title tag

Is there any good reason to stop using optional tags? Personally, I found the code less readable, but it is purely opinion-based, and I think that with some preparation I would prefer one over the other.

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