This season is VERY slow. Elliot almost in the same place as he began after 4 episodes with his insanity. 4 episodes of trying to deal or get rid of mr robot even though the audience knows probably well beforehand that it won't be possible.
Just because the audience knows, doesn't mean the character cannot try to kill off an entity. It makes sense for Elliot because he doesn't want to continue to lose time and end up where he doesn't remember being. If everything was based on audience knowledge, then there'd be no story because nothing would be expected to push forward since you can always rely on the audience knowing. Also, let's not forget that S1 implies on many occasions that Mr. Robot was once killed off ("They are never going to break us apart again. They are going to try to get rid of me again, and I need you to not let them. I will never leave you alone again").
4 episodes and the fbi just gets to a starting point in the investigation
What did you think was going to happen? The scenes with law enforcement and fbi intentionally show how they're laughably behind in dealing with cybercrime. Moreover, Dom only got to the arcade but has no proof that internet activity took place in this place (maybe that changes if she finds code related to the 5/9 attack, but that's not looking very positive considering how well fsociety cleaned up and destroyed their hard drives). Fsociety covered their tracks well enough that no one knows who's in the group.
4 episodes and finally Darlene contacts Elliot
Elliot was out of commission as he was trying to deal with Mr. Robot, and Darlene had to be the leader of fsociety and deal with trying to kill the public's confidence in ECorp. She organized the protest in DC (much to Elliot's chagrin), organized the hack in Madame Executioner's home, etc. They're both busy with their issues, so of course they were going to take a while before Darlene contacted Elliot and asked for help.
4 episodes and Tyrell's wife is still sleepin around trying to figure what to do. We don't know where Tyrell is, which is a mystery dragged on from last years finale
Tyrell isn't a plot point that needs to be rectified ASAP. All we know is that he's apparently alive. However, the more interesting point is that it appears Mr. Robot and Tyrell had devised a plan together after 5/9. Whether that involves hacking, or satisfying Tyrell's ego remains to be seen.
4 episodes and whatever Darlene and crew want to do post hack isn't entirely clear
They want to twist the knife on ECorp's dying body. If they kill public confidence (which seems low but barely hanging in there), then ECorp has effectively failed and will not be able to simply rebuild their database. Everyone will have already taken their business elsewhere. That's why the Elliot-Robot scene in the beginning of Ep4 was significant. They're focusing on the idea that it's simple to hack a company if you know what you're doing, but it's much harder to kill it off since they can simply rebuild.
4 episodes and we don't know what the dark army is doing or wants which was also a last years finales thread
Like Tyrell, Dark Army's motivations don't necessarily have to be rectified ASAP. The implication is that Whiterose is playing both sides, maybe out of intrigue, but more likely because he wants to manipulate the market to his benefit (which would explain why they ended up following through after Elliot destroyed the vulnerability during Whiterose's meeting) and wants Price handcuffed in terms of his ability to recover from 5/9.