'Show don't tell' is
mostly good advice. However, it's not easy, and when done wrong, can leave viewers scratching their heads. That said, when done right, It's absolutely
beautiful.
The best example I can think of for 'show don't tell' comes from Pixar's Wall:e. The first half of the movie, the only words you hear are from a song, and yet It's some of the most expressive and powerful storytelling I've ever seen. Same thing with Pixar's UP. The first 5 minutes are arguably the most heart wrenching in cinema history, but again, hardly any words are used.
(I'm posting the link so you can enjoy this 5 minute masterpiece)
Contrast this with Anime. Almost everything is
thoroughly explained. This is for a few reasons. the directors want to stretch the episode out longer, they don't want you to miss the details, and they think it's the coolest thing when other characters say '
He's throwing the basketball even higher!! Now they won't ever stop it! He's soooo coool!'. Anything that tells you how you should react to something does so because they aren't good enough to convey how you should react.
It gets old fast and gets in the way of enjoying the series.
I totally get it if that's the media you were raised on. The trend in Japan is to over explain things. A lot of western content is written to be applicable to the audience, and won't often resonate with everyone, but it's powerful for those it resonates with. For them, it doesn't need to be explained, and explaining it would ruin it for them.