I agree and think this is especially relevant for sites and apps that target tech-savvy users - as a group they will most likely already be using a browser other than IE and even if they do will be more likely to understand the reason for lack of total cross browser compatibility. If this became a trend it would begin to do one of two things - either cause Microsoft to consider adopting web standards compliance or cause users to adopt alternate browsers. Both options should be equally as welcome in the web development field and help to reduce the time wasted on needless hacks and workarounds to accommodate one product.