I agree with you both that OLED is king with Dolby Vision in a dark room. But Silo has some raised black levels and not that much punchy highlights giving the show a somewhat faded look.
In my opinion the first season of Foundation makes an OLED really shine. The blacks are black, the highlights are punchy and the picture is clean with no noise and almost no grain at all.
The only downside of OLED is films and tv shows with simulated film grain and colors. The grain is really more contrasty on an OLED and there seems to have a new craze of simulating vintage photo or 16mm film stock with coarse grain. I couldn't watch Pluribus, The Studio, HiJack season 2, Club Palm Royale season 2 (the first season looks great on OLED) and The Lost Bus because of the distracting coarse grain and simulated film colors that crushes contrast and color hues making all the advantages of OLED technology moot in my opinion. This is not only Apple TV. The second season of Loki and the movie Marty Supreme is also using coarse film grain and old film colors (they even added dust speckles (!!) on Marty Supreme). Of course, watching a show like Pluribus or Hijack season 2 on a 1080p lcd tv or on a small screen is all right. It's on a large 4k OLED tv that the 16mm simulation looks bad.
Don't get me wrong. Fine film grain can look pleasant when used correctly on a large OLED and I don't mind it on old 35mm movies but the simulated vintage photo or 16mm film stock looks really bad on OLED and I can't wait for this craze to pass.
Compression is also at play here. It can make the grain even coarser or disappear entirely. For instance, watching Dune on Apple movies and on 4k Blu-ray is a whole different experience. You can see a nice film grain and richer color hues on blu-ray while the grain is almost all gone (or sometimes coarser) on the Apple movie stream and the color hues are less natural.