Credit card reversals aren't such a big problem. They affect your trust and you can only reverse so much until you lose your card and the ability to reverse. A reversable transaction that is not tied to trust is completely different issue.
I would argue that in-store purchases are very much tied to trust. At least if you value your identity.
And yet in-store carding happens. So long as the goods aren't too valuable the cops don't do much about it, AFAIK.
The problem is much greater in the case of online spends where there is no camera pointing at your face.
Only for digital goods. Physical goods have to be shipped, which takes time and provides the opportunity to wait for confirmations.