WP3.0 Displaying PHP Code

Browser default style is readable, but using typographic convention can make it more readable.
UA CSS is styled enough to be readable, but bare enough to be 'unstyled'. Dropping code that requires preformatting into a non-pre element is fully unreadable.

Also, I suggest a read of the HTML5 spec: HTML5

Just use <pre>, there really is no reason not to…
 
PHP code with no whitespace is perfectly decipherable, it's just more difficult.

Just like browser default copy styles are more difficult to read.

You seem to have just picked an arbitrary point of difficulty where it's OK to ignore content and presentation separation, I don't know why.
 
I think you're (or we are) confusing readability and legibility. UA CSS is readable, very readable, however it can be made more legible.

Take a look at: Pre

Both are devoid of any styling other than from the UA, the second is unreadable. This is why you use <pre> to preserve whitespace, rather than forcing another element to adopt that behaviour.
 
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