The most controversial aspect on the first list of franchise updates they've allowed players to pick their own Superstar X Factors for players instead of being restricted to the ones are assigned by the Mut 25 coins games. It's a good thing for coaches and owners of franchises that previously had to deal with an X-Factor on a player who might not fit the way they play or perhaps didn't fit any of them however, it can cause issues for commissioners with stricter standards of leagues trying to control their teams.
In this regard the most significant issue with the commishes will be no way to tell whether someone has altered or altered an X-Factor on a player since the transaction log of the league doesn't mark it in any specific way, which makes it unrecognizable from minor changes to jersey numbers or clothing. It's easy to see how this could create a huge problem for leagues who don't view this type of switching between different abilities as being a good idea and it's likely that there will be some leagues who decide to shut off X-Factors completely in light of this new rule.
Personally, I do not believe that this is as significant of a problem as others would. It is important to note that X Factors are dependent on the player's capabilities and require them to meet some threshold to make use of a talent makes sure that nobody will be in a position to use this feature in any significant way. There's no way anybody can use a more powerful running back similar to Derrick Henry and equip him with an X-Factor similar to Juke Box so he's suddenly sprinting around the field like Barry Sanders. Barry Sanders.
In my league, I've offered players in the past the chance to "re-roll" the player's abilities each season and give cheap madden coins players the chance to randomly assign an entirely new X-Factor. Sometimes, they picked one they preferred or a different one, but sometimes they received one they didn't like but when they did get one that they liked less instances, they'd get exactly the same one due to the fact that there weren't many options for the particular archetype. So, giving people the chance to choose their own X-Factors for their archetypes gives them an opportunity to allow for an extra degree of customization without breaking the rules or any other thing.