There is sandboxing to protect the security of your computer.
An application that runs as a snap does not see the system-wide "/tmp". They get their own /tmp. If the snap is chromium, it has /tmp/snap.chromium/
The chromium snap would not be able to view files outside your $HOME. Also, it would not be able to read any dot files in your $HOME. Any configuration it makes, is separated into $HOME/snap/chromium/
There are a few rough edges, but the end of the discussion is that you get better security if something goes wrong, and it makes it cheaper for maintainers to created updated packages, and distribute them.
An application that runs as a snap does not see the system-wide "/tmp". They get their own /tmp. If the snap is chromium, it has /tmp/snap.chromium/
The chromium snap would not be able to view files outside your $HOME. Also, it would not be able to read any dot files in your $HOME. Any configuration it makes, is separated into $HOME/snap/chromium/
There are a few rough edges, but the end of the discussion is that you get better security if something goes wrong, and it makes it cheaper for maintainers to created updated packages, and distribute them.