Hey Matias, that’s really interesting. From what I’m getting out of your user habit, your inbox plays a pretty significant role where you use it not only to process your emails but also to store other pieces of personally relevant information!
For myself, I do use many other productivity apps other than my email (yes, Evernote being one of them) when I encounter anything out on the web for example. The nature of my inbox will be more of a repository of information that I primarily acquire from others. I create labels to sort content relevant to that category within. I don’t tend to send stuff to my own inbox for reference as I will like to ideally keep my feed as clean as possible and also I don’t really have the habit of doing so. In addition, I am usually more concerned about what pops up in my Primary feed than in other pre-set feeds — which is why I don’t usually go and read them.