I think everyone should do a hair cut to their equity portfolio by 50% whenever they do a valuation. Equities can anytime fall 50%. The worst thing is to happen is just at the time of retirement when you are about to hit your number equities fall 50% and psychologically that is devastating.
So it is better to mentally assume your wealth = wealth minus 0.5X equities.
I don't think anybody sensible has 100% of his/her wealth invested in stocks. And if you're planning to retire tomorrow a "textbook" allocation would be something like 30%-70% (30% stocks, 70% bonds), the end point of a many year, glide path portfolio adjustment.
Also, if you're going to take this point of view -- and it could be reasonable -- you should take the same point of view for all assets you hold, including as a notable example real estate. This'd be something you might call your "total household wealth on a distressed asset basis." This is a form of household financial "stress testing."
One reason I like having a baseline foundation of life annuities/longevity insurance from quality payers -- preferably high quality sovereigns (plural), escalating, and joint/survivor (or at least joint/contingent) -- is precisely because such a strong foundation defends against
all downside risks insofar as humanly possible. "Below
THIS our lifestyle will never fall, for the rest of our days." It's also the reason I'm a firm believer in covering genuine insurance necessities, including disability income insurance (DII). Money and wealth have no value except in terms of what it can buy, and what I want fundamentally is worry free lifestyle stability.