[MauranKilom]

The axis is labelled "relative importance". If you place non-zero value on readability, you must place less than 100% importance on "does it work".

[darkwater]

Why? There is absolute no correlation between readability and working status. It might be obfuscated code that works perfectly, or it might be obfuscated code that explodes every 2 days. And it might be perfectly clear code badly implementing a business need or implementing it perfectly.