I believe this has all gone around before...the argument for/against being overweight in equities.
As I see it, the counterparty risk/threat of the game changing...AKA changes in tax law, age of retirement going up and possibility of 401k bail-ins has greatly increased with all the recent "stimulus".

As I keep saying, no investment strategy (stocks, gold, oil, crypto, business ownership, real estate, etc.) is perfect or without risks. Not investing at all, hiding money in a mattress or keeping it all in a savings account, etc., is risky too.
There are just varying levels of risk. High risk = high reward. Low risk = low reward. There are no guarantees, just potential. People just need to educate themselves and go with an investment plan that has a level of risk they can tolerate, stick with it, and be content with the returns (exceptional or mediocre) their chosen plan generates for them.