You're arguing one edge of a very much double-edged sword, and I must say (as someone that was deploying the linux-vserver patches by at least 2004) it's incredibly tiring to watch.
Yes there is definitely a way to praise alternatives without railing against the current discussion topic.
Some may appreciate being made aware of another technology; unfortunately this specific example reinforces the importance of marketing and pursuing mindshare.
No less tiring than reading about re-inventing virtualization in Linux. For both of us the fix is the same: either don’t read it or remark how tiresome it is.
Where we both agree is that it’s tiresome, but for very different reasons.
Some may appreciate being made aware of another technology; unfortunately this specific example reinforces the importance of marketing and pursuing mindshare.