One item that I learned is their fees are just one criteria.  

Only item I see in any of this is most "noobs" would not be able to pull off such a strategy, even most investors across the board wouldn't, your operating at a step above most. 

These few items plus many many more are reasons why there are no legitimate management companies offering the services you're speaking about.

Have you or any of the other posters on here ever thought of starting a business to help non-tech savvy investors set these items up?

These are not words of wisdom, just thoughts and action items that came up along the way. 

You can put a line item for monthly deep clean if you want though.

These are all legit tenant screening items.

However, if someone is so uncomfortable with debt that they can’t emotionally separate debt for investment from debt for consumer items, than they’re probably better off limiting their expectations at to the beneficial aspects of real property investing.  

All of that starts with 1 STR.You are right in your assessment of the importance of AIRs priorities, Not so correct that we need an outside source to maximize these 2 items.

For a number of years, mortgages barely made it as a line-item concern.