[0]: https://github.com/phinze/homebrew-cask/blob/master/USAGE.md...
[0]: https://github.com/phinze/homebrew-cask/blob/master/USAGE.md...
It could also be as simple as "that's the way it works because that's how homebrew works". It's all symlinks, and I personally am a fan because if I want to cleanup what's been done with Homebrew it's very easy.
I do completely understand your point, and agree to a certain extent, but I'm sure there are situations where you wouldn't want things simply copied and left to run/update on their own.
[0]: https://github.com/phinze/homebrew-cask/tree/master/Casks [1]: https://github.com/phinze/homebrew-cask/blob/master/lib/cask...
If it's a use case that would be useful to people, this is a mode of operation I would definitely be willing to include in the project. Feel free to open an issue (or even better - a PR!) with the idea. :)