Dear Mr. Stross,
Your little tirade there was only a little less annoying than an argument about whether an Imperial Star Destroyer could beat the Enterprise-D in battle. I imagine building a time machine into a DeLorean is impossible. I know that an X-Wing banking into a turn makes no sense in terms of real space flight. But these thing can be enormous fun. I've often found that books with similarly ridiculous scenarios are quite a bit of fun to read; that is to say, I enjoy them whether you do or not. Columns, articles, books, and documentaries about how the science in much science fiction is silly (e.g. your piece on science-fictional shibboleths) are a tedious waste of time.
Your books are quite good though
You are always doing something marginal when the boss drops by your desk.