I think the argument could be made that python 3 is an example of &quot;great engineering&quot; and (in hindsight) &quot;poor customer understanding&quot;.<p>Python 3 is the polar opposite to Linus&#x27; meltdown on not breaking user space see: <a href="https:&#x2F;&#x2F;lkml.org&#x2F;lkml&#x2F;2012&#x2F;12&#x2F;23&#x2F;75" rel="nofollow">https:&#x2F;&#x2F;lkml.org&#x2F;lkml&#x2F;2012&#x2F;12&#x2F;23&#x2F;75</a><p>Sadly I like Python 3 and wish it was more popular.