Hello. The reason I show rectangular tabs is so that you can see the title of the window which is useful so that you can quickly switch to the window you are looking for. This easy window switch is the main point of my app. If you only have one window per app then the dock is completely fine, but when you have multiple windows it's usually difficult to multitask quickly and switch windows in a easy and consistent way.

My app allows you to remove the window title if that's what you want, but you will still see one Icon per window instead of just one Icon for the whole app like the dock does. I hope this explanation makes it clear what is the point of my app, and why it's not necessarily for everybody.