Because it’s complex. And it has consequences for how the games are written. And there are 300 questions about how to do it buried inside the request. A save system? Ok, sure. Next comes:
-Your save system doesn’t work!
-Your save system doesn’t have enough save points!
-All the older games don’t have save points!
-Your save system …BLAH.
This ship doesn’t turn quickly. We have a lot of priorities to take care of before we make a decision to redesign how the games are written and made. We want you to have a great experience playing our games, but we can’t turn on a dime, unfortunately.