Fortunately all of these things can be expressed on spreadsheets where their meanings are less ambiguous. A rose by any other name

.
However I would return to the point I started with which was to question purchasing a self managed asset with a 4% target cap.
And how it differs from a managed investment or REIT with a 5% pay-out to investors.
Before you pay a 5% return to investors the asset has to make enough to justify its operation as a business (to pay staff and operating costs, make allowance for asset maintenance and improvements, provide a return to the manager etc.....).
Why would you view a self managed asset any differently, namely:
a) The money you invest has to make a return commensurate with risk and other factors. If you can get 3% at the bank then why cross the street to get 4%.
b) The work you put in has to be compensated (if you can get 5% from a managed investment or REIT why bother working for it).
The idea is not to knock to real estate as an investment but rather an observation on the cycle and its effect on investor mentality towards cash flow
In Canada where we have had a sustained bull market everyone is focused on the equity side. As a result they accept lower and lower cash returns in anticipation of making it up from the gains and mortgage pay-down (which is a distinct element of cash flow apart from cost of borrowing).
At the other end of the cycle in the States (or anywhere else) it pays very well to rental property. If you cannot depend on the back end you need to get paid as you go along.
The contrast is no longer so stark but it still exists.
Cash flow is not the only thing but it is a big thing. It has to support your operations and financing and everything else.