I would argue that the developer’s job should be to determine whether or not supporting users without JavaScript would generate more money than it costs to main

I would argue that the developer’s job should be to determine whether or not supporting users without JavaScript would generate more money than it costs to maintain. It’s going to depend on the target audience and what you are developing. For example: Google Docs with JavaScript turned off makes no sense to me. Hacker News on the other hand could make sense. Much higher percentage of security concerned users and the amount of work to support it is likely not monumental.