Oh, the never ending process of choosing the proper tools. I often have the feeling some fountain pens or too many inks add unnecessary complexity and weight, specially if they are not reliable.
As a theoretical experiment I drew the minimal equipment I'd choose for travels. Note I skipped a watercolor box. Instead I'd use ink from those two Lamy fountain pen. Lamy fountain pens are the key here since they allow two different thickness in lines and can be used for text and draw. These constrains would force me to master the basic tools and feel more and more confortable with them. On top of that the style of the pages will be more homogeneous and less mix of colors like a kindergarden drawing. As other things in life maybe the best option is trying it during a short trip and take note of possible improvements.
I already know it will not happen since there is always room for an extra magical pen to add in the last moment. I have to say I'm full in love with my new tiny watercolor box and I will not leave it at home.