<i>Personally, I find there&#x27;s a ton of things that ought to be concurrent but aren&#x27;t.</i><p>What sort of things? I&#x27;ve been writing web software for ~20 years, and the vast majority of things that I&#x27;ve made boil down to &quot;request comes in &gt; validate input data &gt; transaction to database &gt; check transaction worked &gt; write a response&quot;. Concurrency has never really been a problem, or even something I&#x27;ve wanted.