Except in that parable, Twitter doesn't sell cardboard houses, they used to live in one. And that cardboard house provided enough shelter for them to survive a

Except in that parable, Twitter doesn't sell cardboard houses, they used to live in one. And that cardboard house provided enough shelter for them to survive and at some point, go to the bank to get a loan for a bigger, sturdier house. I understand that Ruby can be an issue at some mega-scale, I've experienced how slow, memory-hungry and not a concurrency natural it can be. But the thing is, for 95% of the people building businesses, they don't need mega-scale. They just need enough. And Ruby on Rails provides just that. It's fast to build a platform with, it's easy to think about, it has a huge ecosystem and it's worked for a lot of people.