In my opinion, bitcoin is very risky if it is stored as an asset because the bitcoin price is not controlled and can not be accounted for if we suffer losses, bitcoin is more suitable for trading and take advantage in the short term.
Many people say the same thing as you before, but now the people who just stored bitcoin in their wallet are millioners. Please see reference
https://bitcointalk.org/index.php?topic=2824748.0Well, anyways, even if I didn't send you reference, I know that many people here can testify that.