This is actually explained in the man page, though it is perhaps a bit
cryptic.
from man dosfsck:
If -a and -r are absent, the file system is only checked, but
not repaired.
(note that -y is a synonym for -a).
The confusing part is what the man page says about the -r flag:
-r Interactively repair the file system. The user is asked for
advice whenever there is more than one approach to fix an
incon- sistency. This is the default behaviour.
As you've demonstrated, -r is not actually the default. the default
behavior is to ask the user for advice any step where it could be
provided. But the default is also to not touch the disk.
The man page should probably be clarified.
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