I don't know that this is normal. It's certainly not unheard of. In this case I just think it's such a huge acquisition that they probably just want to hold off until they get a clear vision from Elon. Why spend a bunch of time and money on something if Elon will come in and advocate for its exclusion from future features? Though I will say that I don't believe that Elon will have a tremendous amount of sway when it comes to drastic changes. I think it'll be a good year or two before we see substantial changes to Twitter as a platform.