I think with your single instance of vim per project, you are the exception that proves the rule.

And I didn’t say that vim can’t interact with asynchronous processes. My claim is that the asynchronous process support in emacs is superb whereas in vim it is not. Hopefully my next comint post will make it clear just how good/easy it is in emacs.

Thanks

As for the async processes, since Vim has the ability to be extended using Python, you could write threaded, thus async parts. For example, I had connected the iNotify python library which is an async process with my ctags-based plug-in for refreshing the database.