Try reading the CanLII database on cases of a similar nature, PRs not fulfilling their residency obligation and wanting to return to Canada later on abound.
Some cases are understandable, but they are the minority. There was one case of a Taiwanese family that received PR, arrived in Canada, went back to Taiwan 4 days later, then tried to return to Canada 7 years later. According to the case file, the reason for this delay was because the principal applicant's father had not given him permission to immigrate and as the oldest son he was responsible for taking care of the elderly parents. After 7 years they made arrangements for the father to live with his younger daughter, and the appeal judge said he could see no reason why these arrangements couldn't be made sooner. They were found to have lost their PR status for not fulfilling the residency obligation. That's just an egregious example, but look up "residency obligation" in CanLII, very enlightening.
For some people, Canadian PR is not a phase of their life, it's a tool: pick it up, use it when you need to, put it down and forget it otherwise.