1) Setting up server to server integrations with FB and Google to send conversion tracking to to the platforms directly, no JS needed.
2) Creating a sandbox to hold pixels (not sure of the tech details).
Though from what it sounds like, this has to be done case-by-case (arduous) and not all vendors support it. Is there a generalized solution for doing that?
Edit: actually maybe it could help with user privacy. If we're only sending over the necessary data to track conversions, instead of letting eg. TikTok run arbitrary code on every page our users visit, that's probably still a win.
If I remember correctly, it wasn't a complete replacement for things like Google Tag Manager if you're using that but it certainly replaced many event tracking calls for a single event tracking call.