As much as we would like the business sponsors to align their thinking of legacycode with business assurance, it is equally important that the IT stakeholders continually seek ways to drive and deliver better value out of their IT assets.
It's also been suggested that this could cause problems for business apps that genuinely rely on legacy CSS code -- although it's worth remembering that we're not looking at a final release here, and none of us (ahem) are even meant to be using it.
Neowin speculates that the reason for this could be to start afresh: by confusing host websites with a new identifier, IE 11 might avoid having legacy CSS code thrown at it, dating back to the bad old days when web designers had to give Internet Explorer special treatment.
The plan finally addresses the tax-code legacy of World War II, by equalizing the tax treatment of employer-sponsored and individually-purchased health insurance.