There have been several conversations like this and every time, I just can't help but agree. This is rookie DM mistake.
If the thing we're trying to do is hard, up the DC. If it's super duper hard, up the DC and give us disadvantage. Don't give us this flicker of hope by succeeding the first time then giving some dumb plot reason to why we didn't do what the check was for so we need to try it again.
