Based on a few issues I saw others encountered in this forum, I think it'd be great to have some kind of tool that indicates the order that code is firing off at. This would help testers with seeing why certain elements are not appearing and/or functioning as expected. I see it as something that could be turned on and shown in the console on preview. First, it would show the order of Experiment JS, Experiment CSS, and Variation Code:
Experiment JS has fired!
Experiment CSS has fired!
Variation Code has fired!
Then it might look for functions within those sections and order those accordingly.