There haven’t been changes to the Hero fragments in Hard Mode Campaign for months, and I think it’s because whenever there were changes, there was always someone who happened to be farming them or was really close to 10-starring them and would come in and express their frustration about a Hero’s removal. But I can’t blame them; I had a few cases like that too, but I didn’t get too worked up about it.
That, and I imagine other things such as implementing a new Hero are more important since it benefits everyone, including the Devs.
I believe the same thought process applies with whether they should change the Daily Quest Hero fragments. Even if they’ve been around way longer, if they do get changed, I can almost guarantee someone will come in saying “I was farming them” or “I was so close to 10-starring them”. Not that they can’t or shouldn’t, but how many times was there backlash, however small, regarding Hard Mode Campaign changes on each Update Notes post? And when changes were stopped, how many times was it brought up afterwards, and was it a negative response or just neutral?