A placeholder is a box that the layout owns and the slide fills. A text box is a box the slide owns entirely. On screen they can look identical, so in practice people blur the two all the time.
What does a placeholder give you that a text box can't?
Four things come with a placeholder that a text box cannot give you.
Position and size are inherited, so every title on every slide of that layout starts in the same place, and Reset returns it there when somebody nudges it. Formatting is inherited, so the type rank, the colour role and the spacing come from one decision. The outline view reads the content, because the outline reads title and body placeholders and ignores free-floating boxes. And the accessibility reading order starts from a sane default, because placeholders come with an order the layout defined. Without them you get whatever order the objects happened to be drawn in.
The outline one surprises people, and Prayaana's deck shows why. Thirteen of its thirty-four titles sat in floating text boxes, so the outline view showed twenty-one titles. That's a capture rate of 61.8 percent. The outline gave a false picture of the storyline, with a third of the argument silently missing, and the founder had been using it as her storyline check. The repair moved those thirteen titles into real title placeholders and took the capture rate to 100 percent. Once the outline could be trusted, it showed two slides making the same claim.
So a mechanical file-hygiene slip had been corrupting a thinking tool, and nobody could see it. The storyline test in the sketching and storytelling branches reads titles in sequence. It can't work on a deck whose titles aren't where titles live.
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When is typing outside a placeholder fine?
Typing outside a placeholder isn't always wrong. A callout arrow on a chart, an annotation or a hand-drawn diagram is a slide-owned object, and it belongs in a text box or a shape. So the rule is narrower than a ban, and easier to keep. Title and body content go in placeholders, and everything else may go where it needs to go. If a floating box holds something that would appear in the outline of a well-built deck, it's in the wrong kind of box.