blog masonry sort option: activating new default category on page load

Hello
Checked the related answers in the support forum, but nothing worked. The I asked a friend of mine: Chad Gipiti – and together we found a solution.

Me and Chad, and Chad and me,
We faced a challenge, tricky as could be.
A line of code, a filter gone awry,
But with patience and skill, we reached the sky!

Me and Chad, and Chad and me,
We solved the puzzle, set it free.
With code that sings in perfect rhyme,
We conquered the problem, one line at a time.

Well, might not be the sky, but it works. My question: Is it “perfect”? I really would like to know, if you consider this as a “very good solution”, or if you find some flaws in it, or if you got something more elegant..
Thanks in advance!
Megan
——————————————————–

function click_masonry_sort_option() {
    ?>
    <script>
    document.addEventListener("DOMContentLoaded", function() {
        var checkExist = setInterval(function() {
            var element = document.querySelector('.primary-projects_sort_button');
            if (element) {
                element.click();
                clearInterval(checkExist);
            }
        }, 100); // checks every 100 ms to see if the element is present.
    });
    </script>
    <?php
}
add_action('wp_footer', 'click_masonry_sort_option');