Mismatching cashflows & discount rates

Why would discounting cashflow-to-equity using WACC lead to an upwardly biased estimate of value of equity. Vice versa, why would discounting cashflow-to-firm using cost of equity yield a downward biased estimate of value of the firm?My thinking is, WACC is higher than cost of equity because it includes the cost of debt: WACC = cost of equity + cost of debt. So if we discount using WACC, it will lead to a downwards estimate. Vice versaWhat did i get wrong here? Help?

For reference, Aswath says its the '1st principle of valuation' 10:20

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