If you are in the business of content and your mission objective is entirely driven around delivering content to your users, you will have a dedicated development and operations team. Your users are the customers and they demand content delivered to them in any number of ways and means. WP's shortcomings increase exponentially when you operate at scale.

> This leads one to your conclusion that because they aren't doing some parts of their job particularly good, they shouldn't be considered.

When it comes to content, your data layer is not just "some part". It is a fundamental component and critical aspect to get correct for sound, scalable content management. WP's database schema and abstraction layers fail miserably at anything beyond the context of a basic blog. I understand WP bills itself as a CMS, but its data handling and architecture says otherwise.

> The risks of being technologiclly dependent on the few people that wrote your custom CMS just arent worth it for the customer.

If your CMS is written in Django, RoR, Spring, etc, you aren't anymore dependent than when you are leveraging Wordpress. No WP installation is without heavy customizations to finagle it to become a poor man's CMS and some group will still have to manage/maintain the mountain of technical debt you've left behind by deploying WP in the first place. Furthermore, the landscape of quality software developers in WP land is bleak to say the least.