My experience is the opposite - Rails projects tend to have tests and maintaining is easy because the test suite is end to end and means something. That said,

My experience is the opposite - Rails projects tend to have tests and maintaining is easy because the test suite is end to end and means something. That said, Rails projects without tests aren't fun. Besides missing tests, I've also seen fat controllers, bad schema design, and not using Rubocop make more issues with maintenance, but usually I interpret as lack of understanding how to use Rails, not Rails being to blame.