Eventhough I usually agree with pretty much everything You have written on this forum about the game, now I have to disagree.
Name is just one field on the database table, and it has nothing to do with simming or stats or anything else for that matter. It is really just a field on the table, and data on that field gets printed to screen, that's all. Every player has an ID, and all other data (name, attributes, gear...) is linked to that unique ID.
"game doesn't know how to react" can't happen by editing player attributes. That would mean that there's not any random factors in the game, and that is not the case I believe. Just by simming two games (cpu vs cpu), You can see that there is some random factors in the game, since the result or the whole gameplay of the second game will not be identical with the previous one. It might be true, that by editing attributes (if we assume that these really have an impact on the game this year) the game can be altered to be something, that EA does not want it to be.
As I have stated above, editing rosters (players) can't damage or break the game. There is already boundaries for the values being used for attributes and all the other things. "They" are not doing it to spite us, but excluding this feature from the game has been done for some other reason than to protect their customers from breaking their game. That I can be 100% sure of.
Again, I disagree with this.