Why WordPress uses `endwhile;` inside the templates?

We often see this insdie the WordPress templates:

while ( have_posts() ) : the_post();
...
endwhile;

Do you have any idea why not using braces or “curly brackets” {} for while loop? What is the gain?

According to the wordpress handbook on php coding standards, braces should be used for all blocks in the style shown below:

if ( condition ) {
    action1();
    action2();
} elseif ( condition2 && condition3 ) {
    action3();
    action4();
} else {
    defaultaction();
}

The use of braces means single-statement inline control structures
are prohibited so it’s better to use the alternative syntax for
control structures (e.g. if/endif, while/endwhile) in this scenario,
especially in template files where PHP code is embedded within HTML:

<?php if ( have_posts() ) : ?>
    <div class="hfeed">
        <?php while ( have_posts() ) : the_post(); ?>
            <article id="post-<?php the_ID() ?>" class="<?php post_class() ?>">
                <!-- ... -->
            </article>
        <?php endwhile; ?>
    </div>
<?php endif; ?>