In principle I agree, in practice I haven't found an OS based filesystem mount that works as reliably as vscode. In particular, I mean the connection is relatively robust, reconnects automatically most of the time after an outage and editing is totally asynchronous, i.e. there's no noticeable pause after saving before continuing editing and no lag (other than what's induced by the electron) when editing.
For Linux and macOS, you can mount ssh directly.
Unfortunatley, Windows makes it a little more complicated.
But there's hope. You can use yasfw with dokany (dokan fork).
https://github.com/DDoSolitary/yasfw
https://github.com/dokan-dev/dokany
Or mount from inside WSL.