I really don't believe that. EVERYONE knows superman's origin... Everyone knows Batman's origin. They've been done a billion times over to death. As far back as the 50's this was a summary that takes less than a minute and got everyone up to speed.
https://www.youtube.com/watch?v=Q2l4bz1FT8U
Between that show, The Donner movies, Lois and Clark, 3-4 cartoon series, 10 years of Smallville, Man of Steel...
They literally NEVER need to start over on Krypton again. We don't start Sherlock holmes over every time with him as a child studying books... We get right into the mystery. Spider-man 2 was able to recap the entire first movie during the opening credits... and that's a lot of what movies need to do more of.
That said, now that really only applies to Batman and Superman. There are some who are legitimate mysteries even to the fans. Wonder Woman's origin can't stay the same even in the comics. Shazam and Aquaman are really first timers... They've been around forever, but nobody really knows their origins... that's legit. Gotta have the origin in the first movie..
But now that we HAVE them... they need to tell something new and original and NOT retread the ground over and over again.. and honeslty, I'm a bit concerned that's what Black Adam is going to be. Wizard grants super powers to a mortal and he has to learn how to use them and how to be a 'hero'... and ultimatedly fail... but theres' a LOT of retreat threat there where he SHOULD have been the villian in Shazam's movie... instead of giving us Silvana but giving him all the mystical powerups... to make him more like Black Adam
Well... gotta say you're wrong there. You can't judge a 2 1/2 hour movie on the plot after 20 minutes. You never even got TO the plot yet. Until SHAZAM came out, I do think Aquaman was the best of the DCEU movies. Took awhile to get rolling, but I loved the 3rd Act when he gets his 'real' costume.
And I'll say you're 100% right here! Never a big fan of Dark haired beared Aquaman... and I spent most of the movie wondering why his brother looked so much like the REAL aquaman

Would have loved for them to switch roles!!