Probably because it'd be like making models in the intro classes Capcom plucks their modellers from.
Yeah.. style..
I guess uprezzed late 90s menu graphics are technically a style. Models and some of the stages look good, everything else is an eyesore. Largely because the hardware makes it look crummy, esp. when you look at how much characters contrast with the stages, where you know they wanted to do more 3D stuff but had to rely heavily on 2D assets and really simple geometry.
And that's Cross Generations of Heroes, Ultimate All Stars select screen looked even worse imo.