Default launchers from Google, Samsung, and Motorola have admittedly gotten more feature-rich and pleasing to the eye in recent years. However, they still implement some restrictions to prevent users from straying too far from their signature aesthetics.
For example, you can’t remove the Google Search bar from the Pixel UI home screen. Similarly, you can’t replace the Google News app on the left of the homepage. The same goes for the default launchers of Samsung and Motorola. You’re only allowed to turn off Google’s News app completely and lose that virtual real estate.