Pixel art didn't replace at all painting, nor did it aspire to do that. But it founds its beautiful niche, and there's beauty in that.
But for strategy games, 2D can still be good. e.g. for card and board games games, even a "3D" game is just 3D graphics over a 2D playing field. Tower defense, factory-building (Factorio). These games have 3D versions but they aren't particularly better than the 2D ones.
[1] https://blog.logrocket.com/making-css-animations-using-a-spr...
> I don't see the why of the voxel sprites compared to the beautiful 3D rendering.
Also, the project homepage says, "SpriteStack is a voxel editor suited for 2D artists"
I imagine the difference is more based around how the creator wants to create. If you are a 2d artist then jumping into 3d modelling can be a step learning curve, but voxel or sprite stacking are generally more forgiving.
I probably love my old classic games more than average. (Still have Prince of Persia 1989 installed.) And love some new indie game with old graphics. (FTL is awesome if you haven't tried it yet.) But 3D and proper physics enable so much more. It feels odd that so much time is spend on recreating old game feeling for some nostalgia sake compared to let's say exploring new 3D physics engine. (Teardown is an indie awesome game if you want to play with an adventurous physics engine in 3D.)