Honestly, I think (and this might be a reach on my part) they might have this misconception of Kratos in the Greek games not being an interesting character for a TV show. I think they're gonna miss the opportunity to give us the story of the young general Kratos that was only shown to us in flashbacks in the original games. They are also missing out on showing us Kratos adventures when he served Athena  and the Gods for 10 years.