Marketing scripts often are invasive, wanting to run before all other scripts or overriding event/clickhandlers. For me it kind of feels you need some runtime

Marketing scripts often are invasive, wanting to run before all other scripts or overriding event/clickhandlers. For me it kind of feels you need some runtime and DSL to enable all requirements in web. And Google Tag Manager isn't it. I'm not saying we should go back to XML and XSLT but some separation of concerns would help: data, display, events, animation.