Try before you buy. Customers can see if they like an app and its extra features before paying, and developers don’t have to deal with as many unhappy customers and negative reviews due to mismatched expectations.
In effect what is the difference between this and the current model where apps release a free version and a paid version? Is the value-add so that it will lock the single app after the trial is over, while the previous solution gives you continued access on the free version?
Also, I've played games such as INSIDE on tvOS where it gives me a trial of the game up to a certain point before it locks further content until I purchase. Are developers not able to utilize functional locks as opposed to time-locks already?
It just doesn't seem like a big deal to me.