To be fair they did planted seeds for Tony to create Ultron. In Avengers 1 when Tony went into that wormhole and came out paranoid af. And in IM3 when Tony was suffering from ptsd and started to further weaponizing JARVIS(Iron Legion)That's true. So it seems like they're going the age of Ultron route with this then. There was no build up to Ultron he just appeared, or was set up, in his first movie and proceeded to wreck shyt. I'm guessing they're doing the same with doom then. I don't know, it could work I guess. But it's a bold move