I think you may have a point. At mature companies, they have largely solved the product market fit and uses a stable stack that just works. I have worked worked

I think you may have a point. At mature companies, they have largely solved the product market fit and uses a stable stack that just works. I have worked worked for such companies, and developers jumped at the chance to use the latest (untested) technologies for greenfield projects if they had the chance. In my startup we also use a "boring" stack, but the problems we solve are innovative and motivation in itself. The developers work closely with customers and can see the impact that the product has. They are no longer working in a Jira-factory and while they are still interested in technology they also find motivation in the product itself.