I still does not get the sense behind this great effort to switch to JS based WooCommerce. PHP + AJAX is absolutely fine, it is easily tweaked, the code is readable and much faster. I am not going to switch to WC Blocks but I am afraid sooner or later we will be pushed to do that by WC. WC is spending tremendous resources to develop Blocks while having literally thousands (1.8K) open issues in their Github and missing many standard features compared to other platforms which makes every integration much more complicated.