But I think the advice I'm hearing from @Julia Lyrberg and @Dave Foster and @trevor finn  is 1) that it might be smarter/lower risk to diversify and 2) that I really might not be able to afford to keep my primary house as a rental.

This is actually one of the main reasons many agents and investors may not like them generally speaking (they are often not serious professionals with a proven track record of success, the vast majority are struggling to find their first deal and are time-wasters to interact with).   

Quote from @Dave Foster: @Scott McGadden.

Of course, after that brief interaction, I'm pretty sure I just become lost in a sea of other text messages.My question is do any of you see a way to utilize a strategy like this?  

There are still many homebuyers that are not as Tech-Savy or may need human interaction to get help quickly.

There are lots more that require a little bit of human interaction and a few more that need full involvement of a person - answering the phone, some AR and AP.

Again, the BiggerPockets store has some books on this topic, or you can learn about it by watching podcasts, reading blogs, and interacting on the forum.

@Dave Foster should be able to answer this.

@Collin Schwartz @Stephen SykesCollin & Stephen, I'm so grateful to have the pleasure of our interactions!

Here's an interactive version of the map, where you can zoom in and see more information such as population and population per acre: https://www.datawrapper.de/_/jDwi4/It tracks the change in population density (population/acre) for each neighborhood (census tract) in the Phoenix MSA from 2010-2020.