What 'works' for someone who was given their PC by the IT department does not work for someone who deliberately chose to buy a product with a tiny market share. Windows users are not interchangeable with Mac users. I don't know if this is because they think that the Windows sales 'validate' the UX design or if it's an attempt to save money by having a single code base (or both?), but the results are invariably awful on the Mac. Invariably, the companies decide that since they have 4x the sales on Windows as on Mac, the correct course of action is to build a product that is identical in almost every way with just a very thin GUI 'skin' on the outside that is Mac or Windows specific.
This is the number one reason that I prefer Mac-only products to products that are available on both Windows and Mac. Unfortunately, instead of making the Windows version of Skype better, they’ve decided to fix the discrepancy by making the Mac version of Skype more like the Windows version. Skype has noticed that there is a discrepancy in quality between the two versions, and has decided to make the two versions more similar to each other.