How to lean down your stack so it will survive longer. That is what I am interested in most. A pure html/css/js stack will probably last 10x longer then the ty

How to lean down your stack so it will survive longer. That is what I am interested in most. A pure html/css/js stack will probably last 10x longer then the typical stack developers use these days. So if you are similarely productive with a pure stack, you are 10x more productive in the long run. As for the same work you get 10x more time of running software. If you are 2x slower with a pure stack, you are still 5x more productive in the long run. I find the question very interesting, where the optimum is. Just pure html/css/js? html/css/js + a frontend template engine like handlebars? A framework like Vue that you include in the frontend? Or a heavy version of it that also requires something on the backend? Should there be a build process or not?