Yep... I get that. Absolutely no slight intended in my question to the OP.
I'm kind of in the same boat as most people and don't have anything at work greater than 2017 and so I definitely get it. We'll have a need for folks to post the XML PATH method of concatenation for the next 4 to 8 years and totally appreciate why you posted that as a solution. I'd have done the same thing.
It's kind of like the days when 2005 and ROW_NUMBER() first came out. Shoot, I still post some 2005/2008 solutions because, similar to what you said, some people don't even have 2012 in place yet.
Bottom line is, I'm right there with you and, unless one has some prior knowledge of otherwise (and the OP on this thread provided none), it's almost always better to post something that will work in the most versions, like you did. You'll never need to justify that to me.
I was just asking the OP if they had a later version... just like I did back when 2005 first came out.