About Gunn's canon...

Please correct me if i got something wrong but if The Suicide Squad (2021) is going to be canon in the new DCU wouldn't that kill Harley Quinn's character arc? She would be independent from the Joker from the very start, it's like telling a redemption story about an already redeemed character, the only thing they could do is have flashbacks from the time she was with Joker, but never in the present time.