Ideas
I know it feels that way and I hope it's not true because some of these issues are now over 6 years old and still not fixed. If you read the bug reports many have an archived filed listed in them as they were active issues on the old forum that had not yet been fixed.
There are now so many "under investigation" reports that whoever is trying to solve the problem, be it this problem alone, is struggling with the coding!!! The interface of the base game and actual game packs trying to get them to all work together without any hitches while creating new packs, must be an absolute nightmare!
One thing most do not consider, that many of the folks who coded the orginal base game 10 years ago, they are no longer with maxis/EA and thus those who are new to the coding of this game, have to deep dive to really see the orginal coding. I empathize with the frustration and the length of time this is taking to be fixed but I also am able to empathize with the folks who are trying to fix it.
Satisifing an audience that demands immediate gratification, in so many ways, is no an easy thing to do!
I lost empathy when the bug is over a year old. There are bugs that still have not been fixed that are almost as old as the game is.