Truth is there was no more money to milk from s1 like it used to be. S2 is just business and marketing, nothing more. They killed S1 because it was the only way to boost S2. Great move of transfering resources and business management. There is no interest to bring the same updates from S2 because it affects the business.
It's like you have 2 products to sell, one old and cheap and the other new and expensive. The point is that you want to keep the best features on the new product so you can maximize profit with the right marketing. This is exactly the case.
Still they won't close s1 because it's always good to have a backup and also because it would affect the image of the company.