As referenced in multiple threads, knowing and navigating the technicalities in this scenario does not really tell the tale. The practical logistics pose some serious hurdles (timely responding to IRCC queries alone, which for the applicant living abroad there are almost certain to be some non-routine requests, can be challenging for an applicant living on another continent) but there are also pitfalls.
Take the use of a mailing address in Canada. There are scores of reasons why people living in Canada have a mailing address apart from their residential address. Common enough practice. BUT for an applicant living on another continent, a "mailing address" in Canada clearly signals more than a mailing address, it signals having a representative (it is not like you drop by every few days to gather your mail at your mailing address -- someone is handling your mail for you and that makes them a representative). Sure, that can be handled by properly declaring the representative in the application. This is, perhaps, a minor detail and one the savvy and informed applicant can handle in stride, but the many tales of trials and tribulations which populate forums like this tend to illustrate how many fail to proportionally ramp up their game to properly cross the t's and dot the i's when they are pushing the technicality boundaries.
And there is still the potential problem of responding to something like a Finger Print request timely, let alone more extensive requests, and showing up on time for a scheduled test and interview, and for the oath, recognizing that the applicant living abroad is quite likely to encounter significantly more non-routine processing and skepticism and less-flexibility.
This is not to say it is so difficult to be impossible. And what the actual odds are for encountering significantly increased problems is an unknown. The odds also vary with circumstances, ranging from how solid the case is apart from issues arising from living abroad while the application is pending, to just how promptly and reliably the representative (friend or family member, or professional, authorized representative) handles communications from IRCC, and of course the applicant's capacity to abruptly get on a flight to Canada to attend an interview or the oath.
Historically scores of applicants have succumbed to the temptation to fudge some of the information in the application in an effort to help the process go more smoothly, including omissions about work or school abroad, fudging address history. Not a good idea.
For an applicant cutting-it-close and living abroad, even if the move abroad is after applying let alone prior to applying, it is simply not all that easy, not at all.
