All of this can be much better and faster locally if you put thought into how you structure your codebase and what tools you use. What I’m hearing is that your product is designed to bring continuous testing to codebases that are not structured well enough to do so locally. I have mixed feelings on this as it may accidentally encourage poor practices in code structure, etc.
Where I think this would bring huge value though is in enabling better continuous testing in cloud-based IDEs. If developers can work on their code anywhere, from a throwaway Chromebook, without the need to spend time setting up their environment, then you’re talking about massive improvements for developers.