I agree mostly and I never said that there are strict categories, and there will never be Judicial proof of that since there is no appeal for Inland, therefore no case to point to.
As I mentioned we can infer that there are circumstances that are more likely to yield a positive outcome than others. To be on the absolute safe side, avoid all travel outside of Canada. BUT I do believe strongly that based on other criteria that apply in other areas of the PR process and the loose wording of IRCC regarding this particular issue, there are indeed circumstances (very limited circumstances) that are likely (not guaranteed) to yield a positive outcome. The circumstances above would be in that category in my opinion, but even then, as I said, it requires some luck (an unlucky person at the border could meet an agent that even refuses to let a WP holder back in the country, leaving is always risky.
I believe however that it is important to consider those circumstances to avoid having people think "screw that I am going, I've heard other were fine".
Just like H&C, it is a blurry case, knowing exactly what circumstances will help (not guarantee) to have a positive outcome can only be inferred, but in some cases like taking care of a person who requires care AND who cannot be helped by anybody else (i.e. important to note the second part as well, having siblings for example there, means it was not necessary in IRCC's eyes), it is more likely to succeed (again, important, not guaranteed).
The distinction is that if we just provide a blank statement with no nuance, it will be ignored simply because there are definitely circumstances where both the risk is lower AND the risk is worth it. Indicating where those circumstances are is I believe important in order to draw a clearer line (my parents are old so I need to see them is on the other side of the line, significant risk and not really worth it).
There is a reason even with Covid that the death of a parent is almost always an exception to the travel restrictions, it is hard enough that people will take some risk, so hopefully we can minimize those risks by following what we know for a fact IRCC considers in other facets of the immigration process.