I don't think it is wise to go all-in 100% into crypto, but it is a beneficial medium for exchange and store of value.
If crypto means including the altcoins, it sure is. But Bitcoin is actually a good one to hold if someone is a maxi or 100% all for it and as you've said, it's a beneficial as a store of value and that's only proving itself year by year and every cycle that comes. I know that you've got more experience than the rest of us here and I think you're now onto the point of trying to diversify and have your assets elsewhere but you'll never leave crypto.
Bitcoin is a good investment but honestly putting all your eggs in one basket is not a wise decision. Once it is called investment, it means there will be risks, no investment is absolutely safe. Not to mention, the higher the return, the greater the risk, and although bitcoin is safer than altcoins, it is still a volatile and highly risky investment.
That's in theory and many people say they don't put all their eggs in one basket but I don't think so, I guess most people invest all their money in bitcoin. From what I observe, people are betting big on this bull run and it is no surprise that they are taking risks in search of big rewards.
I have no problem investing all in bitcoin, it is risky but if they are aware and willing to face the risk if it happens. I mean as long as people are aware of what they are doing they can invest wherever they want.