I think what Ha Ha said here is key.
I believe it was primarily the Ford Foundation and the endowments of Yale and Harvard and maybe some other Ivy schools that several decades ago made total return investing respectable for portfolios burdened by income needs. Now this strategy is commonplace, and recommended by most academics and retirement pundits, as well as the FAs in the trenches. It is also the dominant strategy touted on this board, although that might not apply to the majority who have no pension from corporation or government, and who no longer have any working family members. Something about actually confronting the bear in the alders rather than reading about how to dispatch him that makes him look more formidable.
I become an equity income fan during the 2000-2002 bear market which unhappily coincided with start of my early retirement. (of course the great internet bubble made my ER possible so I won't complain)
In theory it is all very simple, take your $1+ million portfolio with a 60-80% in stock index funds, and 20-40% in bonds, with a cash cushion. Once a year move $40K (4%) to a money market at the end of year rebalance, increase for inflation, rinse and repeat until you die.
In reality I have yet to meet an early retiree who follows the book, but I have met plenty of folks planning for ER who think that is what they are going to do. Perhaps with a government pension or two you can. But when Mr Bear is in full force, all the books, FIRECALC runs etc don't provide a great deal of comfort. (And this is from one of the least risk adverse guys on the board, i.e. angel investor, option writer, high yield chaser, and WSOP poker player.)
The old way has a big advantage; you have good idea what you can spend based on your projected income. For example say your $1 Mil portfolio looks like this
400K stock index funds @2% dividend yield = $8,000
300K bonds/cash @ 5% interest = $15,000
300K dividend stocks/funds/managed payout @5% = $15,000
Total income = $38,000
That is what you spend, with 70% of your money invested in assets with history of income growth a relatively modest annual dividend/managed payout increases of 4-6% keeps up with inflation.
If you run into a bad market like this year where some firms slash or eliminate the dividend and the fixed income interest rate drops to 4%. Your income may drop to say 35K, to keep up with inflation you need to spend 42K. You have a shortfall of 7K and need to dip into your emergency fund/cash cushion. This isn't financially much different than annual rebalancing with a total return approach, but pyschological drawing down 7K from your say 50K emergency fund is much easier to stomach than watching your portfolio drop from 1,000K to 930K (due to a 10% drop in your equity holdings) and withdrawing 42K. Next year if Mr. Bear continues you start to look at ways to bring your spending in line with your income, much the same way you would if your spouse lost his or her job. When Mr. Bull returns you replenish your emergency fund, and go take the vacation and maybe buy the new car.