there is no absurdity. Each method has its use cases and you are not demonstrating anything by using a generic code. Better give a real example with a real image if you want to highlight a fact or to compare between both method.
Both code provided aren't equivalent at all.
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why doing this? I wouldn't call this an equivalent because all depend on the the image you will be using
The point is to show the absurdity of people's constant reaction to use of border-image with "why not just use background"
there is no absurdity. Each method has its use cases and you are not demonstrating anything by using a generic code. Better give a real example with a real image if you want to highlight a fact or to compare between both method.
Both code provided aren't equivalent at all.