Introducing your text is a strategic element
The importance of your introductory text can be extremely useful when you want to place additional expressions on which you want to classify the page.
Be careful, this rule works well on pages that already meet Google’s “quality” criteria.
This means that their semantic signal must be clear (often a very good “perception”) but also have a good authority (strength of the incoming links)
It’s a bit of a “icing on the cake” feature that spreads out the possibilities of classifying a page whose foundations have been well adjusted.
In the 200 criteria used by Google, there is an ON-PAGE optimization rule that advises you to put your keyword at the beginning of your text.