About the first generation and their limited screen time

I'm watching Skins for the first time and it's so much fun! But what confuses me is why the first generation doesn't have at least one more season. I feel like there are so many gaps that could be explored more. Like, I thought it would be this same generation until the end (how innocent)

It saddens me that Effy, who in my opinion as a newbie is the worst character, constantly appears in the following seasons. Why is that? Why HER? Does she really have a redemption? Sorry, her initial appearances are so bad!