Creating a new legacy character (Ms. Marvel), character development over time, (Cyclops) or revealing something previously unknown (Scarlet Witch/Quicksilver) within existing continuity is COMPLETELY different from a reboot. Scarlet Witch, Quicksilver, Carol Danvers, Scott Summers, Hawkeye, all of them their histories ARE INTACT, they have just changed over time within continuity. (I do not read Daredevil, so I dunno what is going on there, but... character development is not a retcon) Nothing AT ALL has changed about the experiences they have been through, their memories of all their past adventures and relationships are still there. Same goes for this.
these characters are not, and have never been, preserved in amber, unchanging. Normally character development is considered a GOOD thing.
Now, I will say that Marvel HAS rebooted/retconned some characters, (Spider-Man in OMD being the one that springs to mind) and I will concede that it MIGHT happen in a few cases during Secret Wars, but it is not a line wide reboot.