You start by saying you don’t want a unified interface where you can get exactly the content you want, then your very next sentence is that you want a single unified interface to get exactly the content you want.
It sounds like you specifically do want a single interface for a la carte content (note: this has nothing to do with ownership vs restricted access), and you currently achieve something like this with a combination of subscription products that bundle a bunch of content you do want with a bunch of other content you don’t want but also don’t care about.
A situation where the price is broken down to individually activate just the content you want and not the content you don’t would offer exactly the same experience but with less irrelevant content and you’d only pay for what you choose to consume.
In other words, the concept of “I pay for one subscription and get exactly and only all the content I personally want” is equivalent to a unified portal for a la carte purchasing.. activating an on-going payment for ability to see Show A and never activating the same payment for Show B which you don’t care for. The “subscription price” is just the total price of your personal a la carte activations (be they ownership purchases, rentals, or recuring payments to license access to that singular content).
At any rate, your comment here is explicitly contradictory.