In the WordPress world, it seems that "free" carries a lot more weight than "open source". While there are many who care, there's also a ton of folks making a living (or just running their own website) by connecting together plugins. I'd make "open source" a bullet point, not a title-level feature.
I agree. Given this particular forum I thought the free and open source aspect of it would be more interesting, but you're right: it's definitely not the drawcard of Tailor. That said, the benefits of it being free are obvious and being open source people can get involved and help shape it (like WordPress!).
