Even if someone cannot create all three layers at once, building them gradually still creates stability. A small cash flow buffer comes first, then a reserve fund, and finally an emergency fund for last resort situations. This progression means that most day to day or even midevel emergencies can be resolved without ever needing to touch the emergency fund.
You should know that when you're investing in bitcoin, first thing comes first which is your discretionary income. When you have your discretionary income available, you can start your bitcoin investment. Your bitcoin investment comes first, followed by your emergency funds as your next priority because that is your backup to your bitcoin investment so that you don't sell it when you are hit with real life emergency.
Reserve funds shouldn't be set up first before emergency funds because that's a misplaced priority. The reason why I said so is because it takes up to one year or more to build an emergency funds of at least three months of your monthly income which means it's the largest portion of all other funds that is prepared down to prevent you from touching your bitcoin investment and it is very crucial to have it.
Your reserve funds can dry up and it would not affect your bitcoin investment provided that your emergency funds is on ground. But if you don't have emergency funds on ground when you're hit with real life emergency, you will use your bitcoin portfolio as your emergency funds. Reserve funds is used to take care of minor issues that if not attended to wouldn't cause any damage to your bitcoin investment.