It probably because the black and blue colour combination is kind to the eyes compared to white and blue colour combination.
And honestly, I do agree with this. The white is a bit too intense to the eyes and may make it slightly difficult to use. I'm pretty sure that's what Adobe did to Photoshop nowadays.
It's actually white and biege/orange, which is also kind. And as a light theme user, it is not intense at all. It's just that a dark theme user cannot adjust their eyes so well to the colour change that it makes it seem like it is intense
I see... Light theme basically have a white, blue and beige colour scheme. Since it is considered as Web Colours, I can see why. And you're right, this white isn't as intense as I thought to be.
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