Editing comments not allowed?

Is it by design that one cannot edit their comments? Or am I just a blind mole? If so, what was the design decision behind this behavior? People are often commenting a product because they have problems with it. I’m creating unnecessarily big whooping threads by searching for possible solutions for people. If I could just edit my comment it would be one answer for one problem at a time with several possible solutions I find throughout the day. What’s the big deal to prohibit this?