The voice recognition is built on Whisper, and is amazing. You can speak conversationally for a long time and it gets everything right, with smart decisions based on context.
My stupid thumbs text no more.
I've found graphene's keyboard far more error-prone than the stock android keyboard, but I also don't care to learn swipe to type.
The feature I'm missing is simply that rubbing my finger left or right on the spacebar in text mode causes the cursor insertion point to move left or right on in the text I'm entering. It makes it sooo much easier to correct typos.
Graphene's keyboard is the stock AOSP keyboard. Most Android systems ship with their own one instead of it, but that's the one that is built into the system by default.
So I still use gboard but block its internet access.