Yeah cash transactions are convenient. So why would someone go for bitcoin?
You can't send cash via the internet. And, you can't use cash if it ever becomes repealed.
No. But won't adoption matter in terms of trust in bitcoin, and how stable it is at any point?
I'm sorry, you're correct. Indeed, the number of users does matter, because what's causing instability is mainly the small number of individuals (comparably to UPI). That's why it's an alternative. Look, you're making some valid points, but I don't see why not having both?