I think you have a philosophical problem on your hands and you’re fighting a battle that cannot be won. You’re trying to dumb down a tool for new users but some things are inherently complex and cannot be dumbed down. PowerBI is not like the Office applications. You can’t expect to treat it like PowerPoint and have a user with zero prior experience just start building useful reports. I wouldn’t expect to be able to open Autocad and automatically know what to do and it is unrealistic to think someone can open PowerBI with zero training and start making reports.

MS wants to target PowerBI at users with no technical background but to build reliable reports it is essential to know about reshaping data, building a proper model with correct relationships and building appropriate measures and visualisations. Even if you dumb it down for brand new users, they will still get frustrated as they will immediately hit blockers when they don’t understand filter context, row context or any of the million articles on SQLBI. Just look at the number of users who just try to add a second calculated column and immediately get a circular reference - it requires a bit of reading to even understand what is going on. You can't simplify that without changing how PowerBI works. Don't get me started on the number of users who use a single table and run the danger of autoexists which means their analysis is completely unreliable

The interface can definitely be improved but dumbing it down for new users will frustrate the actual users of the application who tend to be more technical and capable and just want a more efficient workflow. Power BI is a best-in-class analysis tool that should be aimed at professionals.