Remember when people wouldn't shut up about how difficult it would be to implement these changes and have "options" like on PC and how crappy that would be. I remember. GAF seems pretty happy now.
That's a strawman.
If you have a more powerful platform like Pro that is basically running the equivalent of current gen PS4 games, of course it will have the leeway to provide options.
On a standard XB1 and PS4, that is generally much harder to accomplish without careful optimization that most developers are unable to accomplish just optimizing for the base game to run smoothly in general, especially on their dedicated hardware pipelines.
Sony have said they worked hard at minimizing the amount of effort needed to optimize for Pro on that basis. We can assume if they carry the "Pro" label forward, their numbered consoles will be the base limitation of the generation and the Pro will be the halfway iterative unit to give more oomph, just like what was promised.