There is also the very real part of life that exists in traveling. Especially if you live in Europe, you can find yourself in a different country with different media rights in less than an hour or two in a lot of cases. In those scenarios, it's important to not only manage the complexity of your own customers and the needs of the business as well.
I believe the reason for not doing this is simply because streaming providers would like to keep that option open to avoid losing a customer.