Sick of being picked on, two scrawny nerds with everything to prove create the perfect woman using the strange and mystical power of computers. When the computer is struck by lightning, the woman comes to life because screenwriter John Hughes has never seen a computer.
Why It Made Sense Then:
Lightning + Technology = Magic was just a standard formula for the 80s. It worked in Weird Science, and it worked in Short Circuit, (Hey, they're remaking that, too! Fuck!).
How amazing it must have been in the 80s to not exactly know the limitations of computers. The newness of computers and the fact that the internet was just a distant fraction of a thought meant that technology could be whatever we wanted it to be. Two nerds take a computer, throw in a dash of lightning and create life? Sure, why the fuck not? We leave our toaster on the roof during every electrical storm because we desperately hold out hope for that very thing to happen in real life.
Why It Doesn't Now:
You're on the internet right now. Look around at all the options on your browser. Refresh. Stop. Home. Any "Create Life" buttons? No? Not one? Hm. Do you see anywhere at all that you can just feed cutout pictures from Playboy, automatically combine those pictures to form the perfect woman and then bestow sentience upon that woman? No? Get outta town!
You mean this isn't how technology works?
In 1985 you could treat the home computer as a god-like box of magic (movies today do the same with genetics and nanotechnology), but that pill is just a little bit harder to swallow now that most people own and work on several different computers. And none of them can even get Windows fucking Vista to work properly.
Okay, But Why ELSE Shouldn't We Remake It?
You may have heard that a shitty Sims movie is also in the works, but what you might not have heard is that it's going to be almost exactly like Weird Science. Somehow. So we basically have two remakes of movies that don't need to be remade in the first place with premises that will not work today. Why not be the bigger man, Actual Weird Science Remake, and politely bow out, and let The Sims Movie be the one to shit all over our childhood?