In this oldie but goodie, Hampus Sethfors digs into why disabled buttons are troubling for usability reasons and he details one example where this was pretty annoying for him. The same has happened to me recently where I clicked a button that looked like a secondary button and... nothing happened.
Here’s another reason why disabled buttons are bad though:
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Disabled buttons usually have call to action words on them, like “Send”, “Order” or “Add friend”. Because of that, they often