Venmo[1] does not have reversibility. Cash does not have reversibility.
If users really wanted credit card functionality at the expense of its costs, you could build that as a layer on top, without forcing everybody in the system to use it.
And consider, most disputes is not just about the quality of a product. That is handled with regular refunds. Credit card disputes are a lot of times because of fraud or card skimming, which is very often because the system is not very secure to begin with. Secure cryptography can remove a lot of this type of fraud.
If users really wanted credit card functionality at the expense of its costs, you could build that as a layer on top, without forcing everybody in the system to use it.
And consider, most disputes is not just about the quality of a product. That is handled with regular refunds. Credit card disputes are a lot of times because of fraud or card skimming, which is very often because the system is not very secure to begin with. Secure cryptography can remove a lot of this type of fraud.
[1] https://help.venmo.com/hc/en-us/articles/235171088-Cancel-Pa....