I would say don’t all-in since Bitcoin still contain high risk due to its volatility considering that we are talking about retirement money which you will badly need in the future. You can’t afford to hold longer if you are already retired while the price of Bitcoin that time is lower than your average buy. There’s a lot of time which Bitcoin plunge huge percentage of the price that makes it still a high risk.
I think splitting your retirement plan to stock market, cash in the bank and Bitcoin will be a good idea since you can hedge the risk if one the 3 market crash.
I agree with you, of course it would be better if we didn't put all the assets we have in Bitcoin and in terms of price, of course no one can guarantee that the price of Bitcoin will continue to increase, as you said, it is very true because of its high volatility, of course this would be very risky if We want to maintain all the assets we have for retirement and if the price of Bitcoin does not match what we want, of course this will be very disappointing when our retirement age arrives.
Choosing to divide the assets we have into several areas for future investment is certainly a good choice considering that of the many types of investment, of course we have to have them so that we can enjoy the benefits of what we invest.