If your goal is to limit tracking, this does help, however it won't stop any server to server (versus client browser to server) data pass through. Any events the advertiser/publisher deems important, they can first-party collect the relevant tracking data and pass it from their server to the ad server (i.e. TikTok, Google, MS, FB etc.)
You're right most are doing the simplest things as most marketers do not have tech experience to understand the advanced methods. As more people try to prevent Javascript, you'll start to see more and more companies adopt these methods.
