https://www.techradar.com/news/twitch-for-ps4-gets-a-major-overhaul-new-app-for-xbox-one-coming-soon

Anyone who regularly uses Twitch on the PS4 knows that it was in good need of a makeover. While the app did its main job - allowing gamers to watch and stream broadcasts - its was a bit of a nightmare to use. 

The Twitch 1.21 update means this is no longer the case, thanks to a cosmetic spruce up and better functionality all round.