Hot take- I wouldn’t have been mad if they brought back ultron as the SAGA villain after the studio cancelled Kang

Though I loved the infinity saga and thanos, I always felt like ultron would’ve also been a worthy saga villain, especially after what if season 1.

And I think bringing him back would’ve fit even better with his character cuz right when you think you defeated him for good, he goes back in the shadow (or the web lol) and works on another plan to come back more powerful with an even more evil plan. And especially after endgame where half the avengers are basically gone, that would’ve been perfect timing for him to strike back.

To be specific I would’ve used the aftermath of ant man 3 as the gateway to his return, where Hank creates a more powerful ultron to go against Kang and once he defeat Kang (off-screen) he integrates wjth Kangs armor and gains untapped power.