@TheEvilSkeleton The claim about security is flat out wrong.
File system access *is* full access.
If you can write to the file system, you can write a script, mark it executable, and tweak ~/.profile etc to run it on startup. This doesn't even require being able to mark a file executable, because you can simply add e.g. 'python malicious.py' to the end of the login script.
Now, every time you log in, your entire home folder will be tarballed up and uploaded to some malicious server.
This is just a trivial example, a more sophisticated system would hide itself, and wouldn't be so obvious as to what it was doing.
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