A common problem for advanced apps is the need for Row Owners for data privacy… and then forgetting that this means that many relationships and lookups we plan to use, and think we can use, do not actually work.
I just reported a ‘bug’ which was not a bug… but I had to be reminded why.
So… it would be good in the UX designer to somehow make a note (icon?) when you plan to use a rel or lookup that relies on Row Owners.
Just an idea 