True, but al_bundy is saying that the risk/return in the time period where they are shifting away from equities and into fixed income will be the time where equities' risk should be met with incredible returns.
Well, yeah ... if you think you can time the market, then the best strategy is, of course, keep everything in equities until the peak of the next bull market, then move everything to fixed income just before the bear market hits, then at the bottom of the bear move everything back into equities. Then repeat.
But for those of us who aren't confident we can time the market like that, TR funds fit the bill.