Though, I have thought of buying a personal residence.

Sooner you buy one, the sooner you can buy two. 

Are there any circumstances under which you would find it advantageous to double-close when you had a cash buyer willing to buy assignment from you?

If you're planning on buying MF in Tampa and you think you can find deals that will cash flow, then why not put your money into that and have some cash flow while still buying into the potential future appreciation/cash flow?

@Ryan Ness house hacking means buying your own primary home. 

The market for buyers on QCD is going to be smaller so you are limiting your market with a QCD but we buy/sell homes all the time via QCD just need to find the right parties.  

Lots of time to buy houses.  

Investment Info:Townhouse buy & hold investment in Salado.

I believe the seller now has to disclose it to other buyers if I do not buy it?

That's typically the best place to get market-specific information.