Let me give you an example of the kind of responses I'm hoping to get. (And understand that I have no idea what the real answers are, so in my example the numbers are completely made up!!!)
1) 60% of JS developers use objects casually but don't understand the details very well. 30% of JS developers understand how to use JS's OO features correctly. On the other hand, only 25% of JS developers understand and use the FP aspects of the language correctly.
Additionally, if you have more fine-grained opinions, for instance maybe certain FP concepts are more widely understood than others, that level of detail would also be welcome!
Eliminate fossil fuel subsidies. (If you're not on the edge, you're taking up too much room.)