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Krita is about painting, introduction to digital painting, layers, blending modes, links to fun stuff.
I think we can only maintain compatibility with other applications but not UI-consistency (or consistency in usability, or whatever). Right now we are trying to maintain compatibility with Gimp and Photoshop but these two applications really behave different when it comes down to compositing. For compositing Photoshop uses some kind of weighted average (or whatever) to mix the source color into the resulting color and recalculates the alpha value accordingly when the destination color is semitransparent but Photoshop does this only for compositing while painting. And you can disable this by locking the alpha channel in Photoshop. Gimp doesn't use this at all (besides the "Normal" blending mode). Gimp behaves for all blending modes expect "Normal" like if the alpha channel is locked.
And now we are here with Krita. Krita doesn't distinguish internally between compositing the brush strokes and layer composition (it uses the same code). To make it compatible to Photoshop we implemented the blending mode computations after the specs of Adobe. And since Krita doesn't distinguish between the two compositing types we only could bring this all together by adding thebutton so that the user can choose what he/she prefers.
To explain the behavior in short :