That being said, I do get that for US individuals it is completely rational to use cc's. I would do that too. If you are paying 3% Visa/MC tax anyway, then you might as well use their perks.
In the US, a charge on your bank card results in at least a hold on your bank account - money you can't spend on anything else until the hold is lifted. Worst-case, there can be significant fees associated with this (overdraft, declined payments, etc.).
For most of us, that's a much bigger problem than a debt we may or may not end up paying interest on.
From personal experience, getting a credit card company to quickly resolve fraud cases is also much easier than getting a bank to do the same, even when it's ultimately the same institution.
Now, if you DO manage to that threshold... you still want to delay finances. Because installments now become ways to give your money more time to make money and offset whatever you are paying for. The models and incentives are completely at odds.