I've played through most of the main story and read through a few posts in the forums but I still have some unanswered questions (it's entirely possible that I missed something).
After going to the institute, I was disappointed in how few questions you can actually ask. It felt more like a sales pitch - I wasn't able to ask about the reasons people hate the institute.
Why do they send robots to kill people? - after doing a few institute quests, they make it sound like the only reason they leave is to bring back runaway synths, yet there are multiple areas throughout the game infested with gen 1 synth that clearly were sent there to clear the place out.
Why are there body doubles? I've come across a couple events in game where this was brought up including two identical guys in a standoff. I was able to charisma my way into finding out one was actually a synth... is that something the institute did or was that a runaway synth who picked that person to replace?
Even now when I'm friendly with the institute (haven't made the final decisions yet), why do they send synths to attack my settlements? They're friendly when I get there, but slaughtering my people.... what is their motivation for that?
Basically, if the institute just wants to keep to themselves in their little underground hideout, why are they killing people on the surface? There has been 0 explanation for that as far as I can tell.