I want to copy Bloomberg BDH behavior.
BDH makes a web request and write an array (but doesn\'t return an array style). During this web request, the function returns \"#
So finally you use Array formula, right? As you said, users are not familiar with array formula, they do not know ctrl+shift+enter. I think array formula is a big problem for them.
For me, I have the same issue. I am trying to build a prototype for it. see https://github.com/kchen0723/ExcelAsync.git