I'm confused about why anyone is comparing the security of a defi token swapping platform to that of a fiat savings account.

If you want an apple to apples comparison you should be comparing the security of a savings account to that of a cold wallet. Those are much more alike in their function.

I don't think we classify people who engage in cross network token swapping as "normies". That's like classifying algorithmic day traders as an "average joe investor".