Featured image defaults to ‘large’ size

Hello, any particular reason why featured image is picked by ‘large’ size with no way to override/filter it?

$featured_html = get_the_post_thumbnail( $post_id, ‘large’ );

in \plugins\amp\includes\templates\class-amp-post-template.php line 337 of AMP 1.0.2

but that size is configurable freely by the user.

As for Google req it seems images must be at least 1200 pixels wide

https://developers.google.com/search/docs/data-types/article