With the introduction of the built in AMAZON.HelpIntent intent, I removed my help intent that I had created. The problem is that phrases that I would expect to map to the AMAZON.HelpIntent intent are mapping to a different intent. For example, "help", "help me", and "can you help me" go to the AMAZON.HelpIntent, but phrases like "what can you do" or "can I have a tutorial" are being mapped to one of my custom intents. From your experience, how well does the AMAZON.HelpIntent handle users asking for help and what phrases do or don't work with it?
I haven't tested it in detail. Mostly I think those built in intents are to make it easier for people to fulfill the letter of the requirements for certification. I'm not sure there is anything special about them. If you have a wider variety of phrases you want to support, I would stick to your own implementation.