Would you have preferred "You use a niche browser on a niche operating system which our analytics indicates less than 1 out of 10,000 visitors use, accordingly, we're spending our engineering resources elsewhere and I would not expect resolution of this anytime soon. Toodles"?

Actually, yes. That's way more personable and less canned. I also said, "if you get emails like this" meaning similar in nature, not necessarily subject matter.