We actually had an argument about this and I wanted to remove the filters entirely (since I didn't see a use case for filtering), Louis wanted to keep them. The compromise is the filter button :)

I agree that showing all recent posts types would be more expected given the title. But with the stated purpose of the site right now being to "find people to collaborate with", /ideas posts are the most useful IMO [0]. And I really want people to write more /ideas pages.

Why did you want to see a list of people's /now pages?

[0] An earlier version of this site was actually called ideasideasideas.io and had only /ideas posts. But the other content makes the search much better.