I think those are different things.
To me, if you're trying to access your own information, or access information about a file you have with IRCC, for example, that's not vexatious. You're trying to get something done and move something forward yourself. If you can't do that, I think there should be a complaints mechanism in addition to being able to launch an access to information request.
Vexatious requests are obviously a very specific thing. There is a mechanism—as I'm sure you know—under the current legislation for the Information Commissioner to step in there.