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[EtiamNullam]

The window title of every Nvy instance is just Nvy which seems like a wasted opportunity to give user some hint about the instance open. Seems like settings like title and titlestring are not respected and window title never reflects them.

When you have many instances open its useful to be able to distinguish them by a glance.

Not sure if there is any point in avoiding use of titlestring if there is my suggestion is to always have path to current open directory window title (:cd) or at least currently open file, something like this:

~\vimfiles - vimrc - Nvy

I believe that would be enough for most users.