The biggest OMG when you look at Drupal 7's db at first is: "why there are so many tables?". There were lots of debates regarding Drupal db schema, but if backdrop's target is small to mid projects and better performance, there should be a movement towards getting rid of current "table per field" approach.

There can be something similar to Drupal 6 CCK approach: table per bundle and if field is multivalued it lives in a separate table. There was a project called "PBS" (https://drupal.org/project/pbs) that tried to accomplish that goal but it didn't work out for some reasons.

So what do you things about such a feature?

GitHub Link: 
https://github.com/backdrop/backdrop-issues/issues/56
GitHub Issue #: 
56