I respectfully disagree with pretty much everything you said

. Hopefully your not offended. Except the part about timing the market. That part is correct.
There are plenty of ways to hedge a portfolio, but there is a cost - a real cost and a loss of portfolio gain - ie put options, VIX, diverse assets. Its a difficult task and it isn't going to save you, but might soften the landing. I would say its not for the vast majority of amateurs.
I don't sell winners (school of hard knocks). l also don't like long bonds here. Shorter issues are OK. The 10 year is getting closer to looking good, but the spreads on corporates are still at historic lows. IMHO only.
My 401K is 100% in a Vanguard broad market fund - my best option. I have not looked at it since last Christmas and can't touch it for like 17 years, so I really don't care. I add to it every month, and someday maybe I spend it - if I live that long the Good Lord Willing. The portfolio I manage myself is a different beast for a different purpose. I make money and I loose money - at a rate that would be pretty alarming for most. Price of an education is expensive.
I will say that if your retired and need the money to live on someday, then having it all in equities at this point is a big risk, IMHO. I am not the only one, plenty of analysts point to retirees who are either all or almost all in equities as a looming potential disaster. So far they have been wrong, so maybe they stay wrong forever. Or maybe not.
Not to be construed as investment advice. I am just a simple engineer trying to understand the most complex system man has ever created.