Despite this, they have failed to respond adequately.

I have a similar perspective, as I am right on your heels with the same decision, so I'm naturally inspired. 

Electric and natural gas service may not be discontinued while you are in possession of your unit.

I have not had that happen, but natural gas is a lot more reliable than power. 

The market can be tricky with its block-by-block nature, but it's been a great fit for all-cash purchases like yours.I also have a team on the ground in Detroit that helps manage everything from finding deals to overseeing rehabs, which is crucial for out-of-state investors.

The key factor is the amount paid and the nature of the payment, not the payment method.

I think comparing to the two-- syndications vs index funds-- is too difficult because of the nature of the specific RE under the syndication versus the broad economy(global and domestic) the index funds capture.

Quote from @Stuart Udis: The natural buyer of the entry level SF homes have limited cash and therefore the biggest obstacle they face is funds to close.

And better yet 80%+ of this asset class tenants are home owners by nature, divorcee's in process, there living standards are home-owner conditioned. 

While it’s not impossible to close in mid December and still meet all requirements of the STR loophole, it will be extremely difficult due to the nature of hitting 150 hours, having it rented for 15 days or greater and having the avg stay be no greater than 7 days and not a decimal more.