> On the frontend, you have build pipelines, bundlers, CSS frameworks with their own toolchains, progressive web apps, Core Web Vitals, SEO, layout shifts, srcset/responsive images… I remember when the biggest challenge was IE6 compatibility.

I know which I'd choose. In my experience of the IE6 era, tooling was atrocious, and most (all?) cross-browser testing was manual. Varying box models and no devtools? Give me npm framework churn and layers of transpilation any day.