After 20 years of composing HTML, the world can do better than write full HTML but use technology like jade and not worry about what goes to the browser...
Why not worry about what goes to the browser? In my eyes, what actually runs in the browser is the only thing that matters in the end. You could still write in something like Jade, transpiler, minify, then strip unneeded tags, all with automation.
I didn't mean not to care what goes to the brower, I meant if tools like jade does it right for us, the rest of us no longer have to care about those little details.
Frankly I'm amazed the HTML way of verbose writing still stands after all these years in a fast paced industry.
Hadn't heard of Jade myself so your post inspired me to go looking. On http://learnjade.com/ the front page example shows that Jade doesn't take advantage of this ability to omit the closing </p> tag. So while I agree with you that html is not the best form for authors to write in, Jade itself still has room for improvement.
That is an option of course but then requires further processing by another tool. And Jade is often used real time which means that the need for further processing will be a burden. Is there any reason for the tool to output less than optimized code in the first place? What value is there in producing html that needs to be optimized by another tool?
By the way, Jade is in the process of being renamed to Pug because of a naming conflict with someone who holds the rights to the Jade name in another context.