The results they produce will be used by your accountant when you file, but with that strategy you know it was done correctly and with the lens of your greatest benefit.

Big winners in this are going to be Zillow and people like me or @Russell Brazil , elite brokers who have an elite level of skill and  offer an elite level service but expect to be paid accordingly.Big losers here are going to be the NAR and the mega brokerages like Keller Williams & Re/Max etc....The NAR and these brokerages make their money on the fees collected from the 1,000's & 1,000's & 1,000's of side hustle agents who are producing minimal revenue.

People looking for safe, income producing investments, with tax benefits.

You produced one of the better explanations of DSCR I've seen here.Mike

If it is to play it safe and have a feel for the type of actual operating income that the property can produce before you put debt on it, that's a safe and solid idea.The good news, however, is that you're likely going to be purchasing a furnished property.

If your interest only period is only 12 months, but you have tenants that are only renewing for a small increase in rent, or they elect to not renew and you have to get a new tenant in there, the income that property is producing is negatively affected at the same time your monthly loan payment is going higher, creating the perfect storm for a loan to go into default.

Whether it is purchased from a 3rd party or self-produced does not seem to be a factor. 

Not only will you get deals, these types of leads tend to produce your home run type deals.  

A Quick Word on InflationLast week was a big week for economic data, most notably consumer and producer inflation data (CPI and PPI).

They use their case studies to sell you, but all houses/locations aren't going to produce those same results.