You lose all of the control and these are long term investments - but in my experience the returns match what I had on the active real estate and I am hiring professionals to manage the assets.  

My Daughter was a controller Intel and I think we all know whats happening with that company it has had major issues and is starting to spin off divisions and she got picked to move to Altera as the Finance director of the entire company.

You can make more money if you have full control, but your time needs to be considered. 

Have a bit more control of my time. 

Your strategy takes advantage of your employment cash flow and ability to control discretionary spending.  

Placing your own tenant takes longer (usually 3-4 months with inspections), but it gives you full control over who lives in your property, which is a huge plus in my book.

Where are the HVAC controls and do both units have the ability to access it?

This implies residential units can be built at lower costs than ADU additions and provide better return. 11) adding an ADU to SFH can make the SFH fall under rent control.

If you're happy with getting a note on ANY house in FL you might have more luck, but then you don't have as much control over the condition of the property or its location if those are important factors to you.

@Dylan Jeluso, where are you feeling you don't have control?