Depends on the use case. If its just to be a piece to fill the spot and nothing else, yes. That said, assets impact tone and gameplay, and if you’re trying to judge how something will feel or play, then sometimes you need something closer to the given use case. For example, if you have a survival horror game and are trying to judge the ambiance and visibility of an in-progress level, using wildly out of place assets will mess with the tone, and may result in difficulty in judging factors like the visibility of gameplay elements. Like was said before, the same role as stock assets and programmer art.