In the end we did not feel like we had a lot of choice because we really did not want to lose the contract to buy the house.

Insert the "my precious - lord of the rings" joke of your choice.

Did we make the right choice not to give an extension? 

Wayne, I vote for choices #1 or #2.

We were about to close on a refi locking in a 2.5% 30 year fixed and pulled the plug at the last minute to switch to the All in One, but the lender pretty much told me why I was making a poor choice, so this is very affirming.

With my background as an electrical contractor, flipping seems like a natural choice, however, I'm also interested in BRRRR as I'd like to hold some properties and rent them out.

Your choices are limited since there is only a handful list of lenders who offer such loans, but it is sufficient.

But here's where it changes: The definition specifies that "The choice of specific adults comprising the single non-profit housekeeping unit is determined by the members of such housekeeping unit rather than by a landlord, property manager, or other third party."

Who’s accountable when the result is based on any combination of purchase price, managing contractors, design choices, market forces, blind luck, etc.?

Also check out the book Tribe of Millionaires: What If One Choice Could Change Everything?