This was exactly my first thought as well and I agree it is good business sense. I am in ok with console versions coming out first and getting the kinks out before PC.
Would it be great to do all at the same time? Yeah, but I would rather not deal with another CP2077-like release where it is out on everything and buggy on everything.
They did use the same engine for Part 1 so a lot of the tweaks should likely be transferable. But I rather have them take their time for a polished release too. The Part 1 port was a hot mess and took several months to get in an adequate state.
So it should launch as good as a modern game 7 months post launch. I'm not even going to think it will be a proper launch, but I'll begrudgingly accept a minimum of the quality of a modern game 7 months after they've had time to fix issues at launch.