Is payment the substantial use case of crypto? If yes then where do you think Bitcoin stands? It cost me 0.20$ to make transactions on other payment solution that's not Bitcoin and it costs me over 1$ to make transaction with Bitcoin, isn't the cheaper always the better choice?
You've to understand there are comparisons to be made across different use cases. My personal story with Bitcoin was in comparison to PayPal as a cross-border (international) payment method, a problem you might not experience if you don't live and work in the global South, while wanting to interact with the Northern hemisphere and Europe.
Cost and speed are only one issue -- it costs a lot just to receive payments in a different currency (never mind converting it back), and at the poor rates these services like PayPal use.
But guarantee of access is the bigger issue.
Just this week, I had a payment declined from a Balkan country, after a week (still one of my few clients not yet convinced to use crypto). It will be refunded... within 10 business days, but I already lost fees and time. I actually ditched PayPal because I could get payments revoked MONTHS down the line, and even frozen for months, with repeated KYC on me triggered each time I relocated.
Since some crypto coins have cheaper transaction fee doesn't this make such coins a better fit for payment solution than Bitcoin?.and Bitcoin a better fit for store of value
Again another issue: acceptance. Bitcoin's the only crypto I can comfortably and easily exchange in any country I've relocated to. Southeast Asia, Africa, South Asia, Europe, you name a country, I guarantee there's a P2P network there.
Same if I want to buy something with Bitcoin, any merchant accepting crypto accepts Bitcoin first.
Ether, not so much, USDT, yeah, it's growing, but Bitcoin is king.