Because then it would work a lot worse. Office/Windows is one of the most horribly laid out things ever.
But, if you must have a work-alike, go download the free OpenOffice suite. It’s a Microsoft Office for Windows workalike. Right down to the byzantine menu structures.
I am use to those Byzantine menu structures.
I was not aware that there was now Open Office for Mac. I will have to check it out.
I'm currently using NeoOffice - use it for projects where I need to send files to a Windows user. IBM is apparently releasing a Mac version of Lotus Symphony (document and spreadsheet capability only) early next year which may also be an option. The screenshots of the Windows version look pretty good.