That's a big difference. I can't use a cheap shared hosting and managing a VPS (os updates, database backups etc) is too much for a small blog. Node.js is fine but it turns out after all these years, php is still the king in crud,blog,cms type of application, which is the 99% of the websites out there.
As for the members feature, wordpress has tons of "membership" plugins. Still though, Ghost landing page for members[0] does a great job explaining why i need this. Excellent design and copywriting