it's a serious problem with NBC, i remember beijing 2008 when they started all the feeds on nbcolympics.com, they wouldn't have feeds of the main events and even swimming which was primetime in the east, i still had to wait 3 hours for them to show it in the west.
Then for vancouver even though it was the same timezone as LA, they only showed live the canada-usa hockey final and it was a big deal that it was a live coast to coast
For london they already improved and allowed streaming of gymanstics, swimming, track on nbcolympics, however you had to watch live because there would be no reruns, luckily an evening in london is still a pretty good time in here.
If i remember correctly Rio was the breakthrough, live primetime coast to coast, and everything fully open on nbcolympics, along with rewind and replay even during the live feed, off course the timezone was very good for us.
The one thing about peacock is that if you cant start the feed on time, you should wait for it to be over and then rewatch it, you cannot rewind midstream. I just turned on the diamond league on peacock and i cannot go to the start, just have to finish watching and then rewatch the beginning