Anything looks better than composite. PS2 also outputs s-video, and believe me, it most cases it does in fact look better than component. The exceptions being titles with native progressive support, like Guilty Gear.>and if you look around, you'll find that a lot of games have specific 480p hacks or can otherwise be forced to run at 480p.
There's nearly 4000 PS2 titles released, what you're talking about is a very small fraction of the games released. And, usually requires bullshit like cheat devices or burned discs, which wear down your laser quicker. And, in some cases like in Bengai-O, IIRC, cause graphic glitches. So so much for forced progressive.