Hi,
I understand and encourage the streamlining of efforts. And I have no problem with dealing with the bumps of living on the latest version, be it the VM or the image.
But, please consider the point of view of the one that offers the feedback. Right now, it sounds as if you are shooting down an unreasonable request from Stephan, but in this case, Esteban suggested that we should use the Cog VM instead of the Pharo VM to develop Moose, given that the Pharo VM is basically broken for us.
So, Stephan did exactly that: he used the Cog VM. He reported that the tests do not crash the VM, which I think should be a relevant input, and he also reported other problems while running on the Cog VM. These errors indeed seem to be related to FileSystem, and this just shows that using the Cog VM as a temporary solution does not work. So, we have to focus on the Pharo VM.