I agree that Bitcoin is a poor currency compared to fiat currency, but conversely a dollar is a very poor store of wealth while Bitcoin is looking like it may be a good store of wealth. The confusion comes when you (not you specifically) don’t recognize that you can assess the utility and value of these “things” across various traits. Gold is a decent store of wealth, but a very bad currency. Stocks are great at producing and storing value and are highly liquid but awful currencies.
I’m not a Bitcoin advocate. I’m a neutral investor. You are correct in my view that if Bitcoin collapses it may become worthless forever. We have examples of this happening with fiat currency as well, though, so it’s not a unique trait of Bitcoin.
Diversification and asset accumulation are what I focus on. Bitcoin could turn out to be totally worthless. So could Amazon stock. So could GBP.