&gt; Could you then use idioms in their proper meaning, please?<p>eat lunch<p>eat someone&#x27;s lunch<p>Sl. to best someone; <i>to defeat, outwit, or win against someone</i>.<p><a href="http:&#x2F;&#x2F;idioms.thefreedictionary.com&#x2F;eat+lunch" rel="nofollow">http:&#x2F;&#x2F;idioms.thefreedictionary.com&#x2F;eat+lunch</a><p>...It can refer to market share like you argue, but in a broader sense, this is at least how I understood the term <i>eating someone&#x27;s lunch</i>.<p>&gt; So, zones provide better platform because people can go back and learn Solaris? Or what?<p>No, Solaris (well, illumos, since nobody cares about Solaris any more) provides a better platform for learning and <i>understanding</i> UNIX. And with that comes the insight of writing better code in general, <i>especially on Linux</i>. For example, one is able to write completely portable shell code and deliver cleanly packaged software on Linux if one understands UNIX (in &#x2F;opt, &#x2F;etc&#x2F;opt&#x2F;, and &#x2F;var&#x2F;opt instead of &#x2F;usr[&#x2F;local] -- and that is just one trivial example).<p>zones are a fully working solution because they provide full security isolation, while running as regular processes with their own init(1M), instead of being forced to run Docker inside of KVM or XEN virtual machines to achieve that. And because processes inside of zones are just regular processes in the global zone, they only use as much resources as they need, and no more. With zones, one does not have to hard partition and preallocate memory and CPU to achieve full isolation, as is very often the case with running Docker inside of a virtual machine.<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=0T2XFSALOaU" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=0T2XFSALOaU</a><p>And because zones&#x27; storage is backed by ZFS, the data is guaranteed end-to-end integrity, and self-healing if the zpool is redundant (RAID1+0, RAIDZ, RAIDZ2).<p><i>Writing filesystems is hard</i>: <a href="https:&#x2F;&#x2F;danluu.com&#x2F;file-consistency&#x2F;" rel="nofollow">https:&#x2F;&#x2F;danluu.com&#x2F;file-consistency&#x2F;</a><p>For its part, illumos is <i>the reference system</i> as it is fully POSIX, XPG4, and SUS &#x2F; UNIX03 compliant, so learning it means learning and mastering the standards.<p>And, once spoiled by all the nice features in illumos &#x2F; SmartOS, going back to Linux feels like going back to skins and stone knives.