I see no point in using Apple TV, I have a Sony Bravia A90J Master Series 55" TV its fast though the menus, has every app I can think of and Dolby Atmos and you can also use the TV screen (which is left right and central speaker as a central spekaer with a AV amp. Also Sony has Bravia core which gives blu-ray quality films as long as you can get over 80Mbps.
You can adjust the picture precisely I use Dolby Vision Dark on some apps, Dolby Vision light on others. Also the TV gets updates for security and to sort out bugs, improve picture quality etc and it all works just fine. I do wish companies did make dumb TV's so if you wanted to use a separate TV box you could without duplicating features if that's what you prefer. It would probably give your TV a longer lifespan. At the moment Sony and Samsung are using QD OLED which is meant to be much brighter than the WOLED panels with heat syncs like my A90J but I am not the kind of person that buys a new TV every two years I cant see the point and to me the piucture looks astounding also QD OLED screens have moth eye filters so are really hard to clean without leaving blue smears, mine i can clean easily, its only 3 years old but was bought as new last year in a sale for half the price of when it was new which would have been £2600. Technology has improved so TV's apps stay working for for years now and Google TV works very well. Apple TV just like Sky in the UK never really gave me what I wanted without more clutter.