Either side can walk away from working together if the parameters for the working relationship are set up and understood upfront.

The premise proclaimed at the start of this thread is simply not supported by mathematics with the exception of the specific case where the interest rate on the HELoC/secure LoC is sufficiently lower than the rate being paid on the mortgage.

Is there any advantage of DSCR loans over conventional loans or what do you mean by "understood DSCR loans better"?  

I would make sure however you are investing is clearly understood (see Norada search on BP). 

If, after the first ten (10) days after you take possession of the Rental Unit, it becomes necessary for us to undergo including, without limitation, prevention and remediation in your Rental Unit and/or on the Premises, you will be held financially responsible for reasonable costs thereof, paid as Additional Rent.

Understood!

The city nor our architect understood the structure of the affordable housing regime that allowed this delay.2) our architect was incompetent in moving the project forward.

I understood this to mean no trying to sell  your business or MLM.

As a landlord, sometimes I have prospective tenants apply before they’ve set foot on the premises.

Doesn't seem a great argument against the premise I posed that program sales are primary, REI is after-thought/action.