I just want to add that a good portion of buyers think they are "saving the environment" by buying an electrical car because it doesn't burn any fuel. However I was amazed when I realized that most of them don't understand that the electricity their car uses is most probably (around 94% [1]) generated using fossil fuels and due to loss of energy during transmission they are in fact less efficient than your good old gas burning car.
[1] this 94% is just what I remember from some years ago. seeing as countries and governments have started adapting renewable forms of a energy recently it's probably not as bad but still far from ideal which means the point still stands.
take a look at plex or jellyfin for example. these are media servers that can be setup to automatically organize your media library and keep track of what you have downloaded, what series you are watching, what episodes you have watched, etc. also like you mentioned they also provide some sort of streaming service where you can watch your media over the network without having to download it on every single device.
I'd also like to mention that usually downloading is done using an external software like sonarr or radarr that fall in a gray zone in terms of legality so be careful if you ever plan to go that route.