Wait, why do I need React for a live calculator or sliders updating a table? Does plain JavaScript and the Web APIs no longer exist? Don't Web Components/custom elements exist? I need to immediately jump to React/Vue/etc. at the slightest bit of client-side interactivity?

Also, do people just update and yeet their apps into prod without testing it? What happened to test environments? Test suites? Manual QA? Letting it soak? Where did quality control go?