It's because 98% of the people on here haven't actually used DeFi. The most they've done is bought and sold a little btc or eth on coinbase. The ah-ha moments come from real use.
I've paid tuition twice abroad. Once it took days, multiple forex/bank accounts, and had several annoying surprise fees. The second was in BTC and was settled in five minutes, directly.
It's been said before but the experience is a lot like writing an email versus a letter.