I used healers to max TH9 & Heroes to lv 2x & wall to lego.
You probably didn't use it right :)
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Its pointless higher up, even for farming
Farming is much faster and more cost effective without them. If you use a healer as a th9 or 10 you are doing it wrong. This update actually gives them some utility at higher levels. Still probably not worth it, but getting better