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I think Pixel Art is made to make your brain and imagination fill in the gaps. Once your brain sees something in 3D, it starts to compare it to real life (3D) and not to low-standard drawings (2D).
It's harder to make graphics be on par with our subconscious expectation. We didn't -and still don't- care for the NES and SNES graphics, but we find N64 and PS1 graphics lackluster to today's standard. (In contrast with the fact that we are way more critical to a figure made of poligons, than to a stickman animation.)
Point to the 3d era: it made Pokémon more accesible and popular (that explains the recent sales numbers) because normies and social media can market more a 3D object than a drawing.
That's my opinion.