I bought some (not nearly enough with 20/20 hindsight) right after the 2008 crash.
Is it really smart to compare 401(k)s? With the number of times people change jobs it is not surprising that very few have a million dollars in a single employer account. Most people who keep their money in retirement accounts roll them over to individual IRAs or leave them at their old employers. I only know one person who regularly rolls his 401(k) from one employer to the next.
I had three employers over my career, and I did indeed keep my 401K's together... simpler to manage that way.