Best argument I've seen on this topic.
There's many, many reasons a healer may be out of range. Their fault, or yours - There is no issue that can't be solved with better communication. Like calling out that you're about to go far away, Healers calling out that you've line of sighted them, or tanks advising in advance that they are speed running so healers can be in the right frame of mind to do that, or leave if they don't want to.