They buffed monster damage and to-hit rolls at higher levels because they didn't scale well against PCs in Paragon and Epic tier after they started collecting multiple good magic items. To my knowledge, they didn't do anything that would have changed what I was talking about, which was the comparatively bulky nature of everything as opposed to other editions that had lower HP on average, especially at lower levels.
They buffed monster damage and to-hit rolls at higher levels because they didn't scale well against PCs in Paragon and Epic tier after they started collecting multiple good magic items. To my knowledge, they didn't do anything that would have changed what I was talking about, which was the comparatively bulky nature of everything as opposed to other editions that had lower HP on average, especially at lower levels.