Will Launch need to be loaded synchronously like DTM or can we load it asynchronoulsy? We are still getting feedback from our customers concerned about the Google Chrome error that continues to show up (for close to 1 year now) in the console regarding DTM causing blocking issues
Adobe Launch, like DTM, requires synchronous loading for controlling the timing of rules and beacons. The document.write warning surfaced by Chrome is being addressed in Launch and AT.js. You can see more about the warning in the answer from Corey Spencer here.