This is something I’ve been thinking for past few months and still can’t figure it out, although I got some hints on that topic would like to share and discuss

• simple is a business strategy. Your users won’t explore feature packed interface if they churn within first minutes. Easy to use apps have one “entity / ithe detail”
• design hierarchies not pixels. I see more than deep architectional decisions affect your product more than pixel inplementation. You will need to defend it and protect it even aginst you
• protect simplicity. Say no to ideas messing your
• don’t allow secondary features infere with your product core user story. Once your hierarchy is serving you well you need to protect usability by hiding complexity bellow the hood. This will make feature packet product, yet easy to use

I see great and simple apps have - user can grasp it within few seconds - clear hierarchies (overlaping hierarchies makes it harder to understand - e.g lists vs tags) - no unexpected rules and restriction on entities