Trying to implement designs in a product where every single new design stretches or modifies the design system is mind bogglingly annoying as a developer, especially if you've got a small team trying to crank out new features. We don't need a tenth variation of a call to action, we don't need to use a new, tenth shade of blue or green for just this one place, we don't need a twentieth exception to the existing padding rules. If it is one size on desktop and another in mobile everywhere else, then those are how the sizes should change in this new feature too.
Once you've got a design language in place, leave it alone unless the change to the semantics is meaningful and consistent.
Having done the slice and dice of Photoshop files in years gone past, I'm very glad we have better tools for collaboration now.