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Agreed.
As long as it only does it on *your* screen -- fine. I won't run newsreaders which can display either format as intended. There are too many other nasty things that they can do (and hide), too. :-)
But if it does *not* do that for you (my newsreader displays different levels of quoting in different colors -- assuming that the previous newsreaders all behaved properly in marking the quoting), then it might offer motivation for you (and everyone else) to trim the text you are sending out.
Enjoy, DoN.