Perhaps with our good income you can split out your investment percentage and you would still be very much okay.
Emergency funds is a very important thing that an investor should always ut in place because it's more like the ground to survive every situation, people who don't consider it always fall victim of bankruptcy.
if eventually one has put in some stash into bitcoin it's left for them to be patient with their investments especially in bitcoin because bitcoin is not a Ponzi scheme or get rich quick investment.
Other people are also able to do their Bitcoin investment as emergency funds, for example some people who bought some cheap Bitcoins before and if they will see it, they have profits already but instead, they keep holding it for some reason and some people like me, I already tried it too. I am able to sell some of my Bitcoins before for some emergency cases even I have separate emergency fund.
That's true tho. but this actions mostly taking out of ignorance.
you might be favoured with the actions because you had no issues financially in that process or during those times but if there was an unforeseen circumstances that had took place while most of your assets where in BTC already you would have noticed more of the value of emergency funds before investments.
It's more like a backbone to your investment.