I like Anya Taylor-Joy. I also like Timothée Chalamet. But sometimes it feels like Hollywood only knows about six people at any given time, they don't need to be in everything.
It's because big names sell. It's the same reason big name actors do voice acting, the film wants to sell on the big names. It's not a new concept and it keeps working so it keeps happening.
They list a few options, I think Black Cat is the more interesting option, especially since we haven't had her on the big screen yet. However if they intended to weave Spider-Man 4 into the multiverse conclusion, which is the way they're leaning, I'm guessing Gwen Stacy and Spider-Gwen, at least for a little bit.
Her character in New Mutants was one that I was hoping would cross over. I think an origin/solo movie for Magik would be amazing and could set up some backstory for future projects, but if the MCU reboot is going to happen then I'd rather wait and build a more complete universe and unfortunately probably lose Anya.