[woutr_be]

Wouldn't that mean that both have the exact same responsibility? A bug in the FE, would essentially render the BE unusable, and therefore would cost a lot of money and time as well.

For example; if Amazon's checkout button somehow broke, and prevent users from checking out, it would also cost a lot of money.

EDIT: to give a more visual example, if Amazon changed their checkout button to a different color and style. It could potentially cost them millions, because it might not entice users to click it.

[nnoitra]

Much easier to fix a button then dive deep into why your algorithms which should work, don't work.

[woutr_be]

How so? If that button is part of a complex frontend, with multiple stylings who might inherit from each other, it could be quite a task to fix it correctly.

It's not as simple as just looking into your developer tools, and adding some CSS to it.