This episode was definitely interesting. What was strange is they really didn't do the "what if" moment that changed everything - I guess because that would have been "what is Hope Pym joined Shield?" which would have kinda spoiled the episode. I actually like to see/hear the specific butterfly effect that makes all the changes.
Also, how did an arrow kill Thor? I know he was depowered without Mjolnir but he still would have Asgardian physiology.
It was a nice nod to the comics in which Wasp was one of the founding members of the Avengers, which was left out of the MCU continuity.
Also, besides acting on grief, it's been established in the comics and mentioned in the MCU that Hank had to give up being Ant-Man because too much exposure to Pym particles scrambles the brain... enough to become a homocidal maniac.