To process a new owner payment the system takes an extra week or two.

Once billed, those in violation of the policy won't be able to rejoin BiggerPockets, including prohibition of the use of the agent/lender finder tools, forums, and private messaging system until their bill is paid. 

Since there are often different entities, there are different skills and systems needed.With that said, I can tell you are definitely better at building systems that I am (I have built up some best practices, but they mostly reside in my head).

Not every older system needs to be simply replaced.

Cross border taxation is very complicated, most developed countries like the US and Canada have sophisticated systems to ensure their residents pay taxes, and you are not likely to be able to achieve your goal of not paying Canadian taxes on Florida income while a Canadian resident. 

These investors were looking for Passive income, but they didn’t realize they had to fill the role as an Investment banker and they didn’t have the skill set or systems to do that.  

City assumed it was tied into new sewer system. 

For older properties, expect a higher CapEx due to potential issues with major systems like roofing or plumbing.

Most of the BRRRR literature, books, and podcast episodes were from before rates went up so the systems used to make it happen aren't as streamlined.

However, its downfall (and really what makes it so easy) is that it is a single-entry system.