I'm not going to argue with you. I WROTE partition table utilities in the 80's. You're right, it's trivial -- if you are a literate user who knows what a partition table is.
Most Windows users wouldn't know an MBR or partition table if it bit them on the ass.
And besides, these days, computers are using GUID partitioning. You gonna teach users how to use "parted"? Best of luck.
I'm not disagreeing that it's trivial in most cases. I'm saying that trivial or not it is impossible for today's average Windows user.
You are, of course, completely correct that the average user might not know about this stuff, more's the pity. So, 'fess up - could you write a script and put it on a bootable medium that would take care of this in a single operation? Yes, you could. Haha - admit it! ;-)