Women can't be witchers for the same reason they can't be space marines and no retcon of this is to be accepted

There is that underlying subversive "vibe" that shows a certain degree of intent from the writers in the trailer. They show you.
Ciri being a witcher is a disregard for canon in the name of having a female protagonist. But the plot of the trailer itself gives it away, it's meant to send a retarded message of "women are to be sacrificed by men" in a perversion of the old folk tale of the princess being sacrificed to the dragon, and the fact that when Ciri kills the monster she comes back to find the villagers killed the girl anyway because by damn they're gonna sacrifice that woman whether it makes sense or not, shows that somewhere in CD Projekt is a wine aunt or hateful uggo troon who is making key story decisions.

Speaking exclusively to IGN ahead of the reveal, executive producer Małgorzata Mitręga said Ciri was “the very organic, logical choice.” x.com

Because a lot of people lack reading comprehension, my primary bone to pick with this isn't that Ciri is the protagonist.

Women can't pass the trial of the grasses because they die with zero exceptions(along with 70 percent of the males who attempt it)
It would have made sense if Ciri was a monster hunter acting in the role of a witcher, in fact that's canon. Her being one, however, is not. x.com

She's already has elder blood and extensive experience, the fact that they just shrugged and went "Make her a witcher!" shows that degree of carelessness for the lore, which then flags the chosen plot of the trailer as telling on themselves.
All the hallmarks of Sweet Baby Inc

x.com
This but not people, *men* specifically, that's the message they are giving in the trailer, they're telling on themselves.