If I only took work that I enjoyed, life would be a lot shorter. Uninteresting but better-compensated work allows for free time outside of work to do things I enjoy, and the theoretical possibility of saving enough for an eventual sabbatical or early retirement.
Lack of edits is an important anti-abuse feature. If you can edit a tweet, you can make a tweet saying one thing, and then edit it to say something entirely different after someone else retweets, links, or embeds it elsewhere..
(Though frankly, given how poorly they've handled other abuse-related issues, I doubt this is their reasoning)
If I only took work that I enjoyed, life would be a lot shorter. Uninteresting but better-compensated work allows for free time outside of work to do things I enjoy, and the theoretical possibility of saving enough for an eventual sabbatical or early retirement.