Shiller PER is at 38.5 [1], signaling overheating. Is it now a wise moment to do an all-in of your savings in an S&P index replica? It is dubious to me. I buy bogleheading in general, but some market timing thinking seems unavoidable to make the choice, specially if one is not young and comes from a zero investment prior.
[1] https://www.multpl.com/shiller-pe