Good, then developers might start to develop against standards instead of handpicked browsers. Or if they use a future (unstable) standard that is their own headache (as opposed to user’s; which are subsequently in practice forced to use chromium derived browser).

An app developed against a single browser (as opposed to the web standard) should be considered what it is, an ugly hack, and developers that do it should only do it for their own private apps never to be published until it is standard compliant.