No one "needs" anything made by Apple. That said, streaming via AirPlay and playing iTunes content is not all that an AppleTV does.
Yeah? Last I checked, my AppleTV 4K is collecting dust. YouTube, Netflix, VLC, and even the Weather Channel app all work better via Andriod on my Sony OLED. There is also NOTHING the AppleTV does better than a Firestick or Echo. Apple made the worst decisions with the AppleTV and not making it a gaming platform killed developer interest. All I lost from never using my AppleTV is the ability to view photos on my TV and music Cover Art from my collection.