I think the concept of the yield shield make sense within a Canadian context (which is where Kristy and Bruce from MR hold their citizenship), especially during the first 3-5 years when you're mitigating against SORR. Is it the ONLY thing I would use to mitigate SORR? Probably not, but using dividends to generate cashflow would be one of the strategies I would consider. Especially in Canada, when VCN's (like VTSAX but for Canada) top five holdings consist of three of our largest banks and two of our largest energy providers, VCN tends to generate higher dividends than, say, VUN, with the trade-off of less volatility/slower gains. Using those dividends to provide a bit of a "shield" does make sense.
I think the idea of having multiple diverse (ideally uncorrelated) streams of income is a sound idea, whether it's from a rental unit, REITs, bonds, dividends, etc. I mean, after all, the research says that the wealthiest people have around
seven streams of income, though most normal people will do well with only three to four streams of income.