1. Results everyone knew were going to happen... much like 99% of post-ending cutscene reveals it was stuff we already knew was going to happen had we payed any attention to the game.
2. Yes, the difference is elapsed time, a factor that should be taken into consideration.
3. So, just like every other Fallout game sans NV? For all the complaints about Fallout 3 not being true to the originals, I find it funny that in the one instance it is, people complain.
4. Again... so what? Them doing those things for you in no way means you have to like them, their ideals, or anything else about them. You worked with them only because you had to, since the Enclave had no reason to let you join them. This is your chance to remove what you might find to be an overbearing and cancerous plague on the good of the wasteland.
-In the time it takes for the vertibrird to land, Sarah to get out, talk to you, for you to get in, it to fly off, land, and yu get out, you could make it out in time. I know, I've actually tested to see if it was possible, and it is. Also, you bombed it because the BoS was fighting a battle of DISTRACTION outside, one they might not win, and thus, the remaining Enclave forces could then turn regroup, kill you, retake the thing, and use it again, had you not bombed it. That the BoS happens to win the battle outside is entirely coincidental. This is point blank explained to you as part of your mission breifing before you leave. But who actually listens to the dialog in RPGs, right?
I hope Fo4 has none of these.