Awesome. I've been using GrapheneOS on my Pixel 7 for almost a year now and it's been great. I won't be using this feature, but am happy it might attract more users.
To be fair, in terms of adding features, they probably care more about parity with stock Android (as their secondary focus, since their primary is security) vs actually superceding it.
Has anybody else figured out how to add it back to the Pixel? If so, you might be able to convince them to pull the work of others over.