What does it mean to "miss out on crypto"? It's supposed to be a currency right? One hasn't "missed out on dollar" because they weren't alive in the 50's. This

What does it mean to "miss out on crypto"? It's supposed to be a currency right? One hasn't "missed out on dollar" because they weren't alive in the 50's. This is one of the problems crypto has to solve before becoming mainstream. It should be possible to "get in" at any moment, without being insulted at all times that you only fail to benefit from it because you were too late.