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I did not speak about uglyness, but rather about usefulness.
The windows systray is a part of Windows functionalities. If it is masked, so it becomes difficult to use some Windows features.
Ok, it would be nice to get rid of the task bar, but let's face it: it is an important component of Windows and it cannot be totally ignored.
With parallels, I set the taskbar to the left part of the screen (so not the bottom or the top), and reduced it to the minimum. So it is not intrusive, and it is possible to easily access applications that uses the systray a lot.
I tried to do the same thing with Fusion, but windows are thus deformed (strange bug by the way).
Maybe my use cases are different than yours, but nothing I run in Fusion+Unity is worse for the lack of a visible taskbar.
So, at least for my uses (a few productivity apps, a couple of non-taxing games), which I don't think is an unrepresentative sample, the taskbar is completely irrelevant.