Comment by jcoglan

It is much less safe. PhantomJS has a filesystem API, which is fine when you consider that its primary use case is testing code you wrote and reporting the results. However, given that it is fairly easy to create a bridge between the PhantomJS and WebKit JavaScript runtimes, or to exploit common patterns for making such a bridge, running arbitrary 3rd-party code, loaded over a connection not verified by an SSL cert chain, is asking for trouble. This is an obvious backdoor to get write access to Meteor servers.