Cutting paper is annoying to get straight without a paper cutter.

That a4 x 11" document size prints correctly on A4 or letter without scaling or cropping (the margins just change)

> take scissors to a sheet not an option?

My experience is that it is quite difficult to cut the sheet precisely enough if you just use a normal pair of scissors.

Obviously just an anecdote.

The instructions were just there and I was certain it was the best plane ever if I just had the right paper format. And that they failed had nothing to do with my folding skills.