This is a follow-up to: #2293947: Make "Landing Page" into node + Panelizer (rather than a Page Manager page)

The "Content list" widget is almost perfect for displaying recently posted or updated content across the whole site. However, there might be content types that you don't want to appear there, for example, landing pages.

Since the "Content type" filter is a single select, you can only limit to a single content type, not say "all content except landing pages."

This would be a great feature to have! But we'll have to be careful to make the change in a way that doesn't break existing sites and is as future proof as possible (ie. when new content types are added, the widget will start to include them as well).