That's a fair argument, and if all companies decided to pass the costs directly on to the user at checkout time, the conversation/advice would probably be a lot different.

For whatever reason most do not, so it's advantageous to use the one with better legal protections. It's not only about purchase protection/disputes, but liability and timelines when/if someone steals your card info and makes a bunch of fraudulent charges. The more places you use a card, the higher the chance that info will get skimmed or stolen.

Luckily, while behind, most places in the US have moved to tap to pay which helps a lot with POS skimming. But it only takes one bad employee to photo or copy your card info, or one poorly configured webstore, to leak your information and use it for online purchases. My most recent credit card doesn't even have numbers or an expiration printed on it, for that reason.