Hard to say right off. I don’t know who is developing the visual studio extensions, but I would imagine they are open source and therefore anyone could contribute. It is likely that the developer(s) working on the visual studio extensions started to work on other stuff and the extensions have been placed on the back burner.
Though I’m just guessing. This might be a good question to ask on the developer level of the IRC, as the main Godot developers are fairly active there and they can probably give you a better answer.
