> So since my vape (example, i dont vape) has a power and data slot for charging and firmware updates, i should be limited to only using dual purpose cables day to day rather than a power only cable?

Well, yes.

Why can't you use a power+data cable for the vape (or whichever appliance takes both)? What's the deal-breaker here?

The alternative is labeling, or plugging cables in to see if they do what you want them to do.

Both are a poor user interface.