None of these really make me feel it's not going to play a whole lot different than PF.
1. This is pretty neat and I'll see how it plays out.
2. 2 different ACs doesn't really change a whole lot since PF already had different ACs for situations. Removing touch and flat is nice though.
3...
I will probably get it purely because Pathfinder is the only thing people play around here, so it's a safe bet that people will run Starfinder as well. I just have a feeling it's gonna be a 90% reskin if that and play out almost exactly the same, which I'm not really looking forward to.
I'm...
I absolutely love it so far. I've had a chance to play in 2 one-shots and ran the tutorial for some others so far. The system is dark and extremely deadly.