I have dealt with many of the same challenges that you have, and that is why it is so important to have sufficient reserves and be extremely conservative (especially in today's environment) when estimating/projecting future cashflow.I would say this is especially true when buying turnkey properties from a investment service that provides these.

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.

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

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.

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."

However, as an international investor, I have choices and I'll put my money where it's treated best.

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

The easiest way is to bring on a partner who has a lof of capital they are looking to deploy, but I always encourage having sufficient reserves.  

If some celebrity died on your property and a bulldog lawyer was sufficiently motivated, your LLC can likely be pierced. 

If there is time and money available that is the opportunity to make a choice, but that usually involves INCREMENTAL upgrades like painting a room or replacing the flooring in a room or 2.