To me at issue here is the fact that yes, it is clearly stated that the PR must live in Canada during the application process. It is important to note that this requirement is specifically listed whereas it does not apply to a citizen. It is not about meeting the residency obligation, maintaining the PR status or any other requirement of PR itself, it is a specific requirement for a PR to sponsor their spouse.
If it didn't matter, it would most likely not specifically be spelled out, so going with the assumption that it is no big deal, that you can go live somewhere else is a complete gamble. You gamble that you can get both the benefit of staying with your wife for an extended period and that you can sponsor her successfully. If it works out (and yes it has a chance to work out) you will be glad and celebrate. Now if your gamble does not pay off, you are back to square one, after sacrificing months.
It is easy for others to tell you it is no big deal and go for it, they won't live with the consequences, they won't even care. Now will you come back here and say oh well most people were right I chose to ignore the warnings and now I need to reapply? Most likely not.
Overall it remains your choice. There is a chance that you can have your cake and eat it too, but again it is a gamble, I recommend you discuss this with your spouse and take the decision together whether it is worth the risk. I do not judge, those are difficult times for everyone, we all make our choices. However I would ignore anyone who guarantees you you will be fine ignoring the rule (or the absolutely stupid requirement of proving that you will be refused if you travel, there is no such thing). All you can do is consider the very real risk associated with long travel, and determine if it is a risk worth taking in your particular situation.
For others, I would just quote Clint Eastwood: "You've Got To Ask Yourself One Question: 'Do I Feel Lucky? ' "