The fact in Iron Man 3, we are shown how important Jarvis is to Tony, and then in AoU Jarvis is gone and there is no reaction. He basically stops ultron nuking the world after being Ultrons first victim.
Tony just lost his right hand man and we get nothing? No Tony/vision interaction, no scene of Tony being devastated having had to piece his pal back together, but we see him pick from a handful of other AI’s a few moment later….