Earlier quoted context omitted.
Carrying around or storing piles of foreign currency is much riskier than having a USDT wallet. You also cannot fly to another country with cash.
crypto off-ramps & on-ramps are expensive though. check binance & other markets - e.g convert USD 10 to USDC
Of course, if you're a US citizen transferring 200k USD from Chase to Bank of America, crypto doesn't make any sense.