What's the point of ETA if it is not going to be kept? And if it is not kept, there are always some people who accuse the devs lied to them. They could give you a very rough schedule, which, however, can still be broken. At least, that's what I learned from following some game developing companies for these years. I even have never taken the day & night stretch goal seriously since it seems to end up with plenty of works, which could extend to various layers. As for the companion stretch goal, I imagine it would be basically adding extra content but the AI thingy can make it more complicated. So, I'd wait for it with a caution.
