The Pixel 4 phones have caught a lot of flak for being unable to record 4K video at 60 fps. According to a discovery, however, it would seem that the devices were originally able to do that but the feature ended up not making it to release software.
https://www.notebookcheck.net/New-evidence-points-towards-the-Pixel-4-phones-originally-having-4K60-video-recording.440296.0.html