Why should the different takes on these characters stay only in comics, even in main continuities from the comics we had characters with changing origin stories and stuff whys woyld it be good for comics bit not for movies?
Changes themselves aren't a bad thing, but I feel it's a bad approach turning comic characters into film versions when those characters become unrecognizable to the fans. Marvel has done a great job of walking the line between faithful adaptations and minor changes to their characters, and it's paid off wonderfully. People like their movie characters partly because they recognize who each of them are, the core of the characters are intact.
WB seems to have a habit of changing the core of who their movie characters are when compared to the comic source materials, and IMHO that is a mistake. This new Joker movie sounds to be doing this again, and personally I just want to see DC comics brought to life. Like Marvel has done. The DC animated films do an incredible job of this for the most part, and I really wish the DCEU would just take their animated material and live action it.
Maybe I'm biased having grown up on comic books from the 70's and 80's. It's possible the DCEU just isn't ever going to appeal to me except for a few films here and there. It's also possible I'll enjoy this Joker film a lot more than I expect to and my concerns are unwarranted!