One of the nice things about touring with others is seeing what works/doesn't. I'm sure Knipex has sold at least a half dozen pliers off of our "influencer" post.
My go to must have couldn't live without device is one of these:
mine has three integrated USB ports, enough to charge my phone, GPS device, and tail light. Plugs into an outlet. If I forget to plug it in, I've found it'll keep all my devices charged for two days. No forgetting that one cable you need. It's about the size and weight of an iPhone.
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.