> ... almost no one does it. I've heard an anecdote that Altera kept getting pestered by customers asking why they don't have it--"but why not? Xilinx has it!"

> ... almost no one does it. I've heard an anecdote that Altera kept getting pestered by customers asking why they don't have it--"but why not? Xilinx has it!". So they implemented it just so they could say, "We have it too!". It shut them up, and since no non-academics actually use PR (that I'm aware of; I'd love to hear counterexamples), they've promptly ignored it again :).