Show don't tell still exists because some info dump. Or unnecessary info. Sometimes it doesn't feel like am in the story but outside the story listening to a narrator about the story. Want to be immersed in a story, and that does not make one feel immersed. Spoon fed info.
But sometimes its good to tell a bit more to reveal more bout certain things like backstory or myths or something about that universe the story is built in.
Lots of grey. Depends how one is written.
The thing is figuring out how much to describe. If you basically summarize what happened, dumping unnecessary info, or just dumping info that could be better explained through dialogue and actions, then yes maybe a little less telling.
Some writers when looking through their stuff sounds like this:
Ex: He was heading out to defeat the demon beast today. It was part of his quest. He got up and ate his breakfast. He had three eggs and three waffles from the dining inn hall. He proceeded to slurp it all down. Then he got up to walk to the dish returned place. He dumped it there and walked to the door. He exited the inn.
I don't need to read many short sentences that sound choppy or extra long sentences telling me a paragraph worth of info. This may be better.
Ex: He was gonna head out on a quest to defeat the demon beast today. He took his breakfast, knowing that he needed every little bit of energy for today's menancing task.
If you don't describe something much that is really important and central to plot or character and readers kinda get confused where its supposed go, maybe need bit tell.