I attended for several reasons : have a better idea what are the choices made behind the scenes for such high-profile websites, and to have an idea how these type of companies use the tools a CMS provides.
There were many interesting points raised during the discussions there, but I'll focus for now on the short discussion we had on editors, as it touches ImpressCMS development quite fundamentally.
In a nutshell : for each and every client, Amplexor tries to stop them from using WYSIWYG editors. After a short, stunned silence, someone from the audience made the remark that a WYSIWYG editor is one of the key elements that allow non-technical users to work with content on a page. The presenter agreed, but he asked a very intelligent question I believe we should ask ourselves as well :
What editor functionalities do you want to give your users?
Bold, underline, italics, a selection of a particular style, bulleted and numbered lists and that's about it. Tables, alignment, page breaks? Maybe. Images? With some restrictions, and depending on the situation where you use it.
I know, in their current form, WYSIWYG editors are much more capable than that, but do you want to allow your users to use all those shiny features that will almost certainly break your layout?
No you don't.
Fixed sites are on their way out. The new power words are responsive, fluid grid layouts and media queries. Those allow your site to adapt itself to the multitude of different screen sizes and orientations that are around.
In the end, it's the templates and the theme that define the layout of your content on the page. You don't want your users to put huge images or very large tables on the page that break your site layout.
Currently, we use WYSIWYG editors as a lazy solution: by using those editors, the responsibility for the layout is shifted for a big part toward the user. That's not correct, and it makes the system harder to use, as users have the potential of breaking things. That should be avoided.