Re: Do you still need S-Video inputs when you have HDMI?
That wide-screen signalling advantage for S-video is pretty marginal. If you want widescreen by composite, just change the TV's aspect manually by hitting the remote! For DVD you should be using component video or HDMI anyway, unless your TV is ancient.
For picture quality, on a old game system that doesn't have component video, S-video will be better than composite, you'll get crisper text, avoiding some dot-crawl & color bleeding issues. But if your receiver doesn't have it, so what? Just run the s-video direct to your TV. You are unlikely to have *many* components where S-video is the best connection, where switching on the receiver is desirable, that's why it was dropped as a feature.
Upconversion is not a substitute for using the best signal to begin with. It is merely a convenience feature so that you don't have to switch inputs on the TV. In my view a better way to achieve this convenience is with a universal remote that will switch both receiver + TV for you.
No religion involved, just get your facts straight about composite vs. S-video, widescreen isn't the reason!