CGI wouldn't have been an issue in 1983...and I don't consider Chris Reeve throwing tires at himself to be the pinnacle of his acting career.
The point of the scene wasn't Superman throwing tires at himself, Old Mixer
Come on, guy. Inner turmoil, angst, despair. All that good super hero suffering stuff.
I imagine starring on Broadway with Katharine Hepburn was the pinnacle for Reeve. When the Broadway critics and Katharine Hepburn think you're good, you know you're having a good year. To think he was actually doing a soap opera the year before.
Talk about coming up in the world. Love of Life
. There's actually youtube clips of him from it.