Should PL/SQL Developers Care About "Internals"?

We've posted a new Roundtable discussion with the title

Should PL/SQL Developers Care About "Internals"? 

This discussion point was provided Jeff Kemp, a long-time player of the PL/SQL Challenge who writes:

Our esteemed colleague Steven once wrote: "...regarding the question of
"internal" storage: I have no idea how Oracle manages these structures.
... why should we care? We just need to know that we can use the data
structures with confidence (no or minimal bugs, good performance). Why
get caught up with 'internal' details that can change from version to
version anyway?" Do you agree?

I encourage you to visit the Roundtable discussion page, read Jeff's full presentation, and add your thoughts.