Every month, your employer transfers Bitcoins into a time-locked address that can't be transferred out before you reach retirement age. You have the key to the address. You can verify the transfer on the blockchain.
No middle-men. No funny business. No brokers with pyramid/eyeball shaped logos. No "oops we went bankrupt and lost your retirement." No bail-ins. No raising the age of retirement.
Just Bitcoin.
Things have definitely changed a lot since 2014 when this post was written.
It could be a nice idea, but only after the price of btc stabilizes so that there are no complaints like "oops, I just lost around 30% of my retirement savings because of yet another market crash".