It's more that it is a nuisance to prune the log. Not outright hard, just annoying. To report on all page edits ever, a log isn't even necessary—I just have to fetch the n most recently modified articles. No one sees your embarrassing typo adventures, they just see that one of your pages was edited recently (perhaps not even who did the edit.) No article could appear in the list twice. This is how the site history page currently works, and I personally think it's a rather utilitarian corner-cutting measure, although it's certainly still totally possible to make a complete and perpetual log (or similar.)

At the same time... well, we'll leave that other thought for later.