function block_block doesn't follow API , breaks usage of module_invoke('block','block','view'...

Going by the 6.X API here http://api.drupal.org/api/function/hook_block which states

# If $op is 'view': return an array which must define a 'subject' element and a 'content' element defining the block indexed by $delta.

This functionality is used/assumed in all of the phpsnippets given on how to generate blocks via code (see example below). I'm not sure when the functionality was changed, or why ... but I can find no mention of it in any of the documentation.
....

Additionally, as I delved into it I had questions about the design decision of the boxes/block table structure and normalization.

Table boxes has the following columns
bid
body
info -> This is 'Block Description' in the admin section and what is used in list of modules
format

Table blocks stores the title -> this is the 'title' that is used when the box/block is rendered, and what is refered to in API as the return element 'subject'

As far as I can tell , if you configure a block under a specific theme, the title of all the blocks (one for each theme) is changed. So why isn't title just stored in table boxes?

Attached is the modification I made so that something similar can work

$block = module_invoke('block', 'block', 'view', 1);
$output .= $block['subject'];
$output .= $block['content'];

I am brand new to drupal and still trying to get a grasp of things , if I am misunderstanding some design spec I apologize but just trying to make sence of the API and examples given.