Strong arm sometimes could be a good thing, I agree. But I also understand that for past few years WB's meddling wouldn't inspire fans' confidence.
For WW and AQ, both directors work with people who they didn't cast and both said (at least Patty has news links about it) that they probably wouldn't cast them. And both actors have so many people doubted their acting capabilities or ability to carry their respective movies. Many things to prove.
They both work. Directors, GA and many fans grew to loved them too and now hard to imagine other actors in their mantles.
In another universe perhaps we could have an American actress (like Patty said) or Patrick Wilson (Wan's trustee actor) as WW and AQ.
Actors who aren't what directors have in mind could work. Not all the time, but they could.
And one other thing I wish for the future Batman actor is a mature look.
Someone who is believable to lead and being a father figure for multiple Robins and pop out in 'present days' with loads of history baggage.
Some actors in rumor list seems more 'Robin' or youthful/ babyfaced. Logan Lerman, Dylan O'Brien, Ansel Elgort etc. I don't think that few grey hairs and makeup/ wardrobe work would aged them much.
Momoa and Gal looks young enough but also believable to have teenage (or older than that) proteges. Well, IMHO anyway.