Because the PSX style is inconsistent as fuck and never really figures out what it wants to be, therefore I have no real consistent basis to go by in regards to emulating it. Seriously. Look at X, then at General, then at Eregion, then at Final X4 Sigma, then at Hell Sigma, then at Nightmare Mother, then at Blizzard Wolfang, then at the X4 stage select, then at Gamma Sigma, and then at the D-1000. Then try to find a consistent style. Trick question, you can't.
It's also rather ugly and overly shine-heavy and I really don't like it.
SNES style is much cleaner and gives me far more options for striking visual design that doesn't require whoring solid-white highlights on everything.