curious why space-between classes doesn't use the negative margin approach?

[silouanwright]

This is an example of adding space between items using margin on each item and negative margin on the container, which looks great: https://play.tailwindcss.com/aUjCmcKEb3

However, if you use the space between classes to address this, the margin appears lopsided: https://play.tailwindcss.com/lGibD1Ez3S

The space between classes could have ostensibly used the negative margin approach, just curious what the reason is for not using this approach.