Not all submissions make it to the main gallery. Some submissions are moderated to a users personal gallery because they don't make the cut.
In the past, those submissions would be deleted. Now, you have the opportunity to still "market" yourself and your work. Some submissions that get sent to your personal page will get a ton of hits. Just ask Po' Smedley.

The newest submissions on the front page cycle pretty quickly but you can always see what 's new in descending order from most recent to furthest past by selecting that gallery (i.e. choose Windowblinds and click next until your fingers hurt; there's some good history there).
I'd suggest that if you find a skin that doesn't work on newer systems, you leave a comment on that skin. Let the author know. He or she may choose to update the skin (or just the description).
Tone is very hard to convey in text. Sometimes new visitors to the site start critiquing before they know how things are. This can do two things. One, it can illustrate potential gaps in the system that may need filling. Two, it can make the commenter appear to not care enough to learn what's going on before shooting off their mouth. Now that I think about it, there is a third option . . a mix of the above.
This site has been blooming for years with a constant stream of skinners, blowhards, moderators, coders, asses, and admins. Some folks are lucky enough to become family. Some are more comfortable living on the edges. *SOME* people don't make the cut and are not welcome (and are banned).
I certainly hope you find a place here, you are welcome.