INNER JOIN syntax is not commonly used?

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/13/tutorial-join.html
Description:

This page shows a WHERE syntax to join tables.

After that it shows an example of the INNER JOIN syntax:
SELECT *
FROM weather INNER JOIN cities ON (weather.city = cities.name);

And after that it says the following:
"This syntax is not as commonly used as the one above, "

So, this documentation claims that the INNER JOIN syntax is not as common as
WHERE syntax.
Is this really the case?