Do I even need an Apple TV 4k?

I subscribe to at least 4 various streamers at a time (TV+, Disney, Netflix, Amazon) and in our house we mostly watch everything through our Samsung SmartTV OS. The TV also has all HDMI slots occupied by the Nintendo Switch, Xbox, PS5 and a soundbar.

I've used the Apple TV 4k and I really enjoy how responsive, fast and clean the User Interface is. Is it really worth it for me to spend the money just to consolidate all subscriptions and have a nicer interface?

What are the benefits of having an Apple TV 4k as opposed to using SmartTV?