When you say don't bag your egg in one bag, are you trying to advice individuals to be short-term investors which are traders or people should invest in altcoin?
What he meant is diversification into other assets. But in my own opinion, I will only advise an investor to diversify when he/she has a good Bitcoin portfolio because it doesn't make sense for one to have a small Bitcoin portfolio and choose to diversify into another more risky asset. I have never seen anyone get rich after diversifying by allocating a small amount into several amounts. It is not about the volume of assets we have but the liquidity of that asset. Once we have attained a good level of Bitcoin in our profile we can shift to other assets we loved to and invest in them. Now our main focus is on Bitcoin as we have built a good standard entirely but we are diversifying to other assets to protect our investment so that we won't tap into our Bitcoin investment no matter what.