I find it hard to believe you are doing even half your daily transactions without converting to fiat. I also don’t know how you can wait a few minutes for a transaction to clear potentially dozens of times in a single day. So my guess is you largely deal with dong regardless of how you store your wealth.
This just sounds like a quick sound bite where the day to day realities would tell a more nuanced story.
If it were more convenient, then more people would be doing it. There is nothing convenient about setting up a bitcoin wallet and converting your money back-and-forth between it dozens of times a week, if not a day. This is especially difficult without the regular use of exchanges, which many crypto advocates will try to dissuade you from storing any crypto on, because you are functionally just using a bank again at that point and exposing yourself. “Not your keys not your crypto,” plus another online account to get hacked.
Being your own bank is a ton of work and most people don’t want to deal with that.