Thank you very much for thinking about to make it configurable.
Of course, I do not think about memory, but about the usability:
imagine that every Software on your computer would behave like Atomic Scribbler and keeps the File or Project Open Dialog permanently open: then, you will have 50% of your application Windows which are … just annoying
Here, the usability issue is, that the Open Project Dialog is displayed in the Windows Manager list, e.g. if one uses Alt-Tab to switch between applications.
During the whole day, we would like to use the Open Project Dialog just two or three times - but we have to decide all the day to not jump to this dialog. It is always displayed and we almost always have to skip it.
Or depending on the setting of the task manager, Atomic Scribbler gets two windows in the Taskbar. Therefore, we can not just click once to the Atomic Scribbler icon to open it: Windows displays the mostly useless Open Project Dialog and the application Windows and we always have to decide for the real target window.
Maybe, this is no problem if someone just writes stories. But we are full time “technical workers” (Project Managers, Software engineers, Requirements engineers, etc.) and at this moment, I have more than 15 active applications. Therefore it is very helpful if almost never used Dialogs do not offer an additional target in the task manager.