Why does history needs to repeat itself the way it did in 1999-2000. If the 1999-2000 debacle never happened or if it did happened but we were not born or too young to remember, we would not have that bias.
The new generation as they grow old in the next 10 years will remember the pandemic and the 2020 March market crash for what it was: the shaking out of the previous generation of investors who cashed out in a great hurry (close to retirement etc,) while opening door for them to build foundations. Sure there are the Robinhood gangs on WSB but many are not.
The same way that value investors, youngsters then, fondly remember the Dot.com crash and how it presented opportunities to them ... while also providing them with a gift of a bias - point of reference - forever seared into their minds: Remember 1999
There are many ways to see the past. We chose to see things in a linear way and choose to draw clear parallels between events, because it suits us.
The question to ask is then, is experiencing 1999 a handicap ? is the gift of a bias a curse.