Well, it's all but stated that the Vulcans helped. One of the few good lines in Dear Doctor is T'pol noting to Archer that Vulcans came to Earth in 2063, and 90 years later, they're still there.CharlesPhipps wrote: ↑Sun Jan 27, 2019 9:35 am I think a lot of fans assumed the Vulcans are in part responsible for humanity going from Fallout 3 to Mass Effect in a hundred years. That they've been giving humanity Vulcanian aide ala the U.N. out of their principles of helping a disadvantaged civilization.
Hoshi even points out to a bigot that Vulcan medicine did save one guy who had a terminal mutation.
In that respect, Archer comes off as monstrously bigoted.
Going from a place that's post-apocalyptic to a one world government, establishing space colonies, improved health, no more war, etc, that's such a huge and daunting improvement that it strains belief that the Vulcans didn't help. Especially when humans are having joint missions and having aliens doctors and experts help them out in a variety of fields. Archer may not have liked a Vulcan overlooking his dad's work, but by his own father's admission, the Vulcans have been a lot of help.
Soval even does state that they the Vulcans are a bit apprehensive about the humans progressing so fast, and it seems that they are proceeding by trying to make sure Earth is as stable as possible before they expand everywhere. After all, an Earth that has no hunger, disease, war, or other needs has little reason to conquer the Galaxy like the Klingons or Romulans did.
Hypothetically, they were probably telling the humans, "No, that'll blow up your ship. Redesign it and do it again." It makes the humans learn, and prevents casualties, but would seem very frustrating to anyone trying to progress and explore.