Realize that you need to design around it.  

I am not sure if it is more effective. 

Hi BP community!  I currently House Hack in Everett, WA (near Seattle) and utilize FurnishedFinder for our basement ADU with great success. I have built up enough equity and savings and will start adding multiple rent...

We have our own design team, contractors, and real estate agency under one roof, which saves time, cuts costs, and improves communication across projects.

The one big caution I would have for investors on the design is don’t make the room size too small.

They are designed particularly with mother-in-law or next generational living in mind.

Let's look at your example of a roofer, assuming he owns the company.He has to pay for employees- they still get paid, even if they are not giving 100% effort.He has to pay his workers to go back for warranty work - effectively paying them to do the same job twice.He has to pay for equipment, even when it's not being used 100% of the time.- but the company he bought it from still gets paid.He has to pay for advertising, whether it works or not.- but the advertising company still gets paid.He has to pay for accounting services, payroll services, tax services, legal services, etc.- they all get paid whether he makes money or not.So, what's your point?

Detroit requires strong local relationships to navigate things like neighborhood nuances and property management effectively.

You also will still need to manage your property manager  - ie, stay on top of expenses, ensuring your property is being managed effectively etc. 

My current solution of using Baselane is by far the most cost effective and easiest, but it still requires that I spend time bookkeeping.