My point is that lots of things, like LinkedIn, totally support IE11 for the very good reason that lots of people still use it in work settings. So my users don't frequently see any such message unless they go to some modern site that doesn't want to care as they consider their audience to not include people at work.
If a site doesn't support IE 11 and it does have a work based audience it will lose out to the competition who do support it. Whether that matters depends on the product in question and the people who might be interested.
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