For now this is a test function tested with a random sample on a small number of users. According to Google developers, the new button will allow you to quickly add short videos of interest to playlists, and this is what video hosting is also striving for. The dislike button will be moved to the main menu of the YouTube Shorts player.
According to testers who left feedback on the new functionality, given the rapid change of vertical videos, the new button will allow you to save the necessary stories with the ability to quickly rewatch them. However, according to analysts, moving the “Dislike” button will deprive users of quick reactions to Shorts they don’t like and train algorithms not to show such videos again.
Source: Ferra

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