My sister and her husband got their citizenship last year, and they did not have that experience, and her husband travels a lot.
I have travel to countries that do not stamp in your passport, like Israel and Cuba, so this is why I know stamps in passport doesn't carry any weight now. There is no indication in my passport that I visited these 2 countries. Actually, I just return to Canada 2 weeks ago, and all the agent at the airport in Saskatoon do, was scan my PR card, and welcomed me back to Canada, he did not stamp in my passport, some agent stamp, some don't.