There's " in your face " story telling and " in your face " graphic violence.
They could have shown the massacre begin, and close doors, or shown arya under a table seeing the body fall one after the others, or so many other things.
It's just the " cutting throat with blood everywhere in full frame and full frontal four times in 30s " that I found a bit too much. Especially the last one, between the 10s pause and the sudden cut to the credits ...
They could have ruined the scene, yes. I'm glad they didn't.