https://wccftech.com/pixel-4-video-recording-40k-30fps-google-explains/

The inception of the Pixel 4 and Pixel 4 XL marked the first time Google introduced a multi-rear camera sensor array on its mobile devices. While more sensors are advantageous on the latest smartphones in some situations, Google also decided to limit the Pixel 4’s video recording capabilities to capture 4K footage at 30FPS. The Pixel 4 XL also gets the same treatment, most likely appalling even the staunchest supporters of the latest handset lineup. Regardless, Google is here with an explanation, but it’s highly unlikely everyone will be pleased with what the technology giant has to say.

One possibly shocked smartphone user with the Twitter handle @stanzillaz questioned about the Pixel 4’s video recording feature not including the 4K 60FPS option. Google replies that most people will stick to video recording at 1080p and it’s possible the company didn’t want to include 4K 60FPS just because other manufacturers have included this option in their own offerings. Additionally, Google states that instead of opting for a 4K 60FPS setting, the company’s employees instead focused their efforts and resources towards improving image quality for the 4K 30FPS option.