Is there a way to ungraft parts?
Not presently, that's actually a constant conversation point with the team. The main hangup is the idea that when you graft an arm to your body, you're removing the old arm, so we thought un-grafting would completely remove the limb from a narrative perspective. For immersion, we haven't added the option.
That being said though, if it's a feature you'd like, we'd be more than happy to add it.
You definitely got the conversation started again, for the time being, we're going to add the ability to remove the graft. As well we're going to make it so that you can upgrade the graft while it's still connected to your body. We noted that short-sight as well.
We'll likely have that update pushed out in the next few hours.
Thanks for your feedback!