NW has nothing to do with cashflow because certain assets simply cannot generate cash flow.
For example, DW and I inherited some valuable artworks. They are a nice line item in our NW but they generate zero cash flow (and in fact cost us money to insure and store).
Another example: DW and I own some gold. They are a line item in our NW but they generate zero cash flow.
One more example: DW and I own a nice plot of buildable lot on the coast with 180 degree clifftop ocean views. It's a valuable property and looks great on our NW, but generates zero cash flow and in fact costs us money in property tax, insurance and maintenance.
I get that some real estate can be mortgaged/leased/rented out to generate income, but then you'll have to structure it just right to make sure that the resulting income more than offsets the property tax/interest payment/insurance/maintenance you'll have to pay (not the mention the hassles of dealing with tenants and navigating local rental laws and regulations). Sounds great in theory but getting the execution right is quite another matter, and I certainly wouldn't recommend this as cashflow generating strategy for primary residence (as you suggested in a post up thread).
FWIW---DW and I own multiple land, residential properties, rural properties and shares in industrial properties + alternative (cashflow negative) assets, so I'm speaking from extensive experience.