Do we need people editing other people's posts to remove"Thanks"? And thereby bumping old questions.

Yes, this is a popular practice at some sites such as https://stats.stackexchange.com/ . I don't think we need that here.

Some recent examples by one eager beaver.

https://or.stackexchange.com/posts/4603/revisions

https://or.stackexchange.com/posts/2779/revisions

https://or.stackexchange.com/posts/2741/revisions

https://or.stackexchange.com/posts/5030/revisions

Do we need people editing other people's posts to remove "Thanks", thereby bumping old questions.

Saying thanks, and people leaving it, is a popular practice at some sites such as stats.meta.SE: What's the site policy on removing text such as “thank you”, or “This question is too easy”. 

I don't think we need that here, but at Meta.SE: Should 'Hi', 'thanks', taglines, and salutations be removed from posts? removals seem advised.

Some recent examples by one eager beaver:

1. https://or.stackexchange.com/posts/4603/revisions

2. https://or.stackexchange.com/posts/2779/revisions

3. https://or.stackexchange.com/posts/2741/revisions

4. https://or.stackexchange.com/posts/5030/revisions

Can we not have superfluous text added in the first place, nor remove it long after the fact. Don't create extra work, and don't dig up old posts with trivial edits.