When I do painted style pieces, detail is a very lovely thing haha! However, I intend to create comics, and when you have multi-panel pages, overcrowding becomes an issue. Too many details makes the page too busy and makes it hard to focus the readers.
Blurring can be an excellent tool to avoid overcrowding panels, yes! There are other methods too, but in casual setting blur works well to make a character feel set in the world without distracting the reader from the narrative/details you're moving the story with. I still have much to practice with the art of making comics, but I've been focusing on concept art like this so I can get into practicing actual pages~