That's not the point. The point is it's not built it, because the architecture decisions were unsound.

Now, don't get me wrong, I use and like Wordpress. There is not more versatile yet approachable blog/CMS/whatever out there, the ecosystem is huge and it's my go to tool when I want a quick and dirty solution.

But it doesn't change the fact it has been badly designed from the start.

Popularity in software doesn't reward good design. It rewards solving problems.