They don't have any powers relating to ticket prices or kick off times. You know the things that fans are most affected by.
These were never available to fans until the 2017 final as they are just unwanted club Wembley in effect, and most of the tickets are the same price as they were in 2019 for us. I have never paid more than £70 for any sporting event, including CL/FA/LC finals, Euro 96 Final, Mike Tyson v Francis (bang on £70).
I may be stuck in the past price wise but I couldn't enjoy myself if I paid £100+ for any sport or gig. I don't think the FA cup final prices are terrible, but wouldn't pay them if only Cat 2 , 1 or 2nd Tier were left. Imagine a family of ST holders 2 adults and 2 kids paying £860, when a load of cheaper ones went out the back door.