These articles pop up fairly often so I'm just sharing their thoughts, I happen to agree with them that a Schwab card is a simple and easy way to deal with possibly needing cash while you're traveling, although that is becoming less and less likely.
It's also a good way to keep to your travel budget, you put your travel money in the account and use the card as a debit card to pay for expenses. Except the biggies like plane fare and hotels, which benefit from the protections of an actual credit card.
https://thriftytraveler.com/reviews/credit-card/atm-fees-charles-schwab-debit-card/