As such, it's just not a good idea use one for now.
As an aside, I don't even know why IDN's are allowed, it offers too many opportunities for domain spoofing and phishing.
IDNs will take years to be pervasive, just like Unicode before it, because it is a painful upgrade to something designed in a different era. It doesn't mean the endeavour isn't worthwhile.
You know that statement clearly is not true. Just look at keyboard designs used the world over.
I know English is increasingly pervasive, but there are still billions of people who don't speak it at all or speak it only very poorly (and it's not exactly very easy to learn). The internet is a global network, and so should allow people to communicate easily in their own languages. This current pain with IDN is just a legacy of the internet's origins in America and Western Europe.
Heck, the example in the article are just using one letter found in German. You don't need to go very far from English to find these problems.
www.cítíbank.com
instead of
www.citibank.com
a very real problem and will make the web more dangerous and will encourage the further growth of "walled gardens" on the internet which I think most here agree is a bad thing.