That sounds awesome. One point though - VS Code also allows you to setup a reproducable dev environment locally or through an SSH connection. It isn't clear to me based on the video if that feature is exclusive to Space or not.
And VS Code's hosted offering (VSCode.dev and GitHub Codespaces). Fleet doesn't seem to run in the browser which could offer a better UX. The remote capabilities also look to be more seamless as VS Code is still local by default and even after you connect remotely, it still mostly offers to open/browse local files (which could be considered a pro)