Okay, and how many people put 100% of their money in at December of 1998? Versus how many people have been dollar cost averaging for the last 30+ years?
* https://ofdollarsanddata.com/now-do-japan/
Further, it's not like the US is immune to long periods of minimum returns:
* https://www.forbes.com/sites/investor/2010/12/17/the-lost-de...
Perhaps these examples are a lesson for what's important: diversification.