Not really a big deal I just want to understand why Simple and Variable products are added to cart different manner?!
For example, when I add to cart Simple product, notification about successful adding to cart is being shown in little pop-up window. But when Variable product is added to the cart, this notification is being shown in the same window above product.
I wonder why it is not the same for both?
For now there is no such possibility. Sorry.
If you wish you can disable Ajax “Add to Cart” option in Theme Options > Single Product Page, so simple and variable products will be added to cart similarly.