I don't think the difference would be significant. How many of your HTML elements would become interactive with htmx? There's a limit to how much interaction you can reasonably add on a page. This will also limit the number of new attributes you will introduce in the markup.

Also, by this argument should we leave out the 'href' attribute from the '<a>' tag and let the server decide what page to serve? Of course not, the 'href' attribute is a critical part of the functionality of HTML.

Htmx makes the same argument for the other attributes.