The loss of the small task bar icons will be annoying to me. I always fight to minimize UI real estate in my workspace, typically selecting the most compact / small offering that is still workable. I strongly prefer my task bar to remain visible but take up minimal space. I've become "used" to this problem though as UIs have all gone more and more finger friendly (read: big) over time. Definitely a good thing for the right use case, but please don't take away my option to get your application to be as non-instrusive as possible.