Please double check what your accountant mentor meant . . . if she was really concerned about TFSAs growing over the limits she probably shouldn't be mentoring someone about accounting. :P
Not necessarily disagreeing with you their considering she was a CPA and running her own company, but my boss and I weren't exactly close and we didn't talk about much.
Most of what I absorbed from her on Accounting Knowledge came while I was working on my own computer, and listening to what she said on the phone to clients as well as what she talked/complained about to my fellow Employees.
So I can't exactly call her up after almost 2 years and ask, but I am honestly really curious about what she meant.
It was a long conversation with another Employee, where she specifically complained about the client repeatedly investing close to his limit, and it consistently growing over, and that he should have learned better by now as this had happened multiple times with him having to pay fees and that it's happened again.
It's something I very distinctively remember, but not only have I forgotten some of the context, (How confident am I that they were talking about TFSA's specifically?)
But Memories are notoriously unreliable without a recording to back them up, so while I put a decent amount of stock into a memory that clear, I also always have to at least consider I may be distorting parts due to time.