I literally included why I think it's retarded in that very post you responded to. It also happens to male characters, frequently>inb4 men defrosting like women don't get retcons too
Just off the top of my head
Sue Storm's dedbaby was retconned into Valeria who is a strong female character in her own right (by fucking Mark "RAPE" Millar of all people lol)
Barbara can walk again, which is objectively pretty ableist if you're an idpolfag (you're likely just a TERF-tier retard feminist however)
Carol Danvers has been made into a top hero at Marvel, had everything negative that ever happened to her retconned
Wonder Woman is one of the most popular heroes in the world, is one of the most powerful heroes in the current DCU
Zatanna is now in a shitty YA type book but seems to be in pretty good shape as a character (crickets on her dad being fridged for her story though!)
I don't even remember what C-F listers they trotted out as examples but I'm sure most of them (and guarantee 100% of the DC ones due to N52) have been changed back.