Sure, I get the idea of currency speculation. You can speculate on anything including currency. The problem is when you try to make currency out of a speculative asset. In this case of bitcoin the value is highly volatile, so you would not want to use it as a national currency. I do know that bitcoin was originally envisioned as a currency, but most people are using it as an investment. You also have not addressed the issues I presented.

I don't think it's reasonable to think about it in such a simplistic way.

BTC has been subject to massive swings. Just looking at CoinDesk, it was easy to find a time where it doubled in value in less than a month. Why would any reasonable person spend that sort asset?

I think the dynamics of the market are as important as the technical features that some digital currency has.

But for the average crypto investor who isn't a whale and isn't insider trading on the whales, the dynamics of the market are effectively just random. This isn't like a stock where you can objectively look at the company, compare it to other companies and understand how it derives profit. It can't work either as a currency or as a reliable investment.