This is kind of a shortcoming of all package management in general; should deleting the package delete your user data? There's an argument to be made that data should be removed with the application, but deleting data irrecoverably as the default isn't necessarily the easiest approach.

There's also another problem, which is that the behaviour of deleting data may make sense for per-user applications, but for system-wide apps, should uninstalling an application start nuking data in people's homedirs?