I agree the process issues are troubling and need to be addressed in the very near future; however, that is a separate matter than the TA before us.
I disagree that the letter is a well written or a well thought out argument. His emotion and anger ooze out after just a couple of paragraphs. Most of the premises to support his argument are mere suppositions, not verifiable data or facts. Using a series of questions to prop up your position is not an effective technique. It only invites more speculation.

I suspect this letter will be praised by the hardcore no voters, ridiculed by the solid yes votes and just dismissed by those on the fence...so in the end, it is no help.