Having said that, rents go up over time and as you mentioned tenants are paying down the mortgage (with more going to principal over time). 

At full occupancy, the cash flow I just keep in reserves for repairs or help pay the principal. 

They've never navigated a period like we are in now and they haven't pivoted from their boom times playbook.If you manage to get your principal back you'll have to pay back the taxes you've deferred (depreciation recapture).

I had no exposure to this group but recently heard one of their principals on this podcast.

I understand that rents will go up over time and my mortgage payment will pay down the principal, but it seems like investing the $1.43mil into rental properties and/or a low fee US stock market fund may work out better for me. 

.: Massive loss of accrued interest and principal????

Here are a couple of developers you should take a look at Trion Properties, their principal Max Sharkansky posts here on BP, https://www.biggerpockets.com/blog/top-5-markets-multifamily-rentals-2019and Feldman Equities out of Tampa (3rd generation real estate family famous for having built the terminals at Chicago O'Hare) who are among the only ones opening up downtown skyrise office buildings to accredited investors.

They didn't extend loan maturities because they were looking out for borrowers--and the moment they feel the market is strong enough for them to liquidate the asset they will foreclose and/or force a sale to recover as much principal as they can. 

I check the SEC, FINRA, ratings websites for inside information on the principals in the company.

Without house hacking, your figures would look like this:$1850+1850 = $3700 - $1500 - $3200 = $-1000 net in your pocket (let's skip principal paydown and tax benefits for now).With house hacking, your figures would look like this:$1850+650+1500 = $4000 - $3200 = $800 net in your pocket.