Why exactly do we need it? I want to be a part of this advanced technology, when I am using btc I wasn't controlled by any organizations or institutions. That's freedom.
That encapsulates my feelings about bitcoin to a T.
I rarely spend bitcoin on things that I can pay for with my debit card or with cash, and I never considered bitcoin to be a good currency because of its crazy volatility. However, if the world ever had a banking crisis like the one we had 10 years ago, and if the fiat system failed completely, there would be a dire need for a currency like btc. Right now, tho, its much smarter to use fiat to buy things with and to hodl btc. And I think nearly everyone is doing just that.
There is little need for stable coins in my opinion, except as a substitute for cash on exchanges. They don't offer an advantage over simply holding cash, and it isn't like any stores are accepting USDT or any of the others. They're more or less useless in my mind.