In at least one case, there is a need currently for a tag visitor to run after another tag visitor has run:

The tag visitor in Enhanced Responsive Sizes needs to run after the IMG tag visitor be

The Image Prioritizer's tag visitor is currently registered with the name ID of img-tags which is not ideal:

It should rather be prefixed like image-prioritizer-img. The image-prioritizer-img string could even be defined as a class constant like Image_Prioritizer_Img_Tag_Visitor::ID. When Enhanced Responsive Sizes registers its tag visitor, it should be able to explicitly declare this dependency:

function auto_sizes_register_tag_visitors( OD_Tag_Visitor_Registry $registry ): void { 
	$dependencies = array();
	if ( class_exists( 'Image_Prioritizer_Img_Tag_Visitor' ) ) {
		$dependencies[] = Image_Prioritizer_Img_Tag_Visitor::ID;
	}
	$registry->register( 'auto-sizes', 'auto_sizes_visit_tag', $dependencies ); 
} 

Then there wouldn't be a need to rely on action priorities (and the current implementation of OD_Tag_Visitor_Registry) to ensure that one tag visitor runs before another.