There is absolutely no need to comply with a request to lower the blinds and if you don't want to then don't. As has been remarked , some of the scenery is spectacular and why shouldn't you see it? Those who wish to sleep can use their eye shades and modern IFE screens do not require a darkened cabin. Too often the request on daylight flights is simply to reduce the call for cabin service, especially during the long periods (ie all but the beginning and end of the flight) when manning levels are reduced so as to accomodate agreements on cabin crew bunk rest. You bought the ticket and if you want to watch the scenery you are perfectly entitled to do so.