The horror of needing to replace a routing layer. Why is this not a solved problem?

This is an undervalued advantage of using steady frameworks like Rails that in essence is the same as 20 years ago, but with lots of extras. I don’t remember any big changes in the routes at least. Nor in any of the other basic building blocks.

You could come back to rails after a 10 year break and pick up pretty quickly where you left off