Those reasons are terrible, and are easily refuted. From reading the discussion as a whole, theLet's go over them one by one.

>>It will leave even less room in the question preview so that we have more difficulty gauging what a question consists of by reading the preview.<<

Sounds like it can be easily solved by changing the preview algorithm to filter out words like "Hello" and "Thanks".

>>It takes time to read and parse through those questions when I am trying to spend my time more efficiently reading through the actual question and figuring out how to appropriately answer it. If I have to start reading all the little side comments and snarky humor inserted in there it detracts from the overall message.<<

I can understand about the side comments and snarky humor. But how long does it take to read the word "thanks," exactly?

>>If this is supposed to be a website which is servicing more than just the primary author, we need to think about how we construct messages so that they appear more clearly to those searching on google for questions that match their own. If I am looking for a solution for question X, I want to find someone who had the same problem, not their short autobiography and formalities before getting to that actual question.<<

Again, editing autobiographies and pitiful attempts at rumor is totally fine. Editing out "thanks" however changes the tone of the post, and the tone of the site in general. When reading a question, it is important to keep in mind that there is a human on the other hand. Having salutations and thanks in there helps convey this.