Well, the image quality is better.
Not hugely, but some of the text is easier to read, there's a little less artifacting.
I just wanted to bring it up to the same dpi as Issue 2, basically.
Thanks for the explanation. I can in fact see a slight difference in the boldness of the text in at least one place, though the difference is very slight. Whether it's worth the very much larger file sizes and slightly slower page-rendering performance is debatable! I can understand your wanting to make the standard consistent across issues, though in my view there are real advantages in keeping the file size smaller, and I think I'll retain the old PDFs myself, especially given that there are no corrections in the new larger versions.
I don't know what screen you're using, but on my 27-inch desktop monitor there's certainly a little more than a "slight difference". The text is now twice as crispy, and most of the (very distracting) image artifacts on the smaller version is gone.
From my part thanks a lot for this improved version! There's absolutely no reason for doing any less quality than this for the purpose of using it in any post-1995 PC, and anyone who prefer smaller sizes can easily compress it online if they so wish (while the other way around is not possible for obvious reasons).
Since you ask, I'm using a 27" iMac of the final generation before Apple stopped doing 5K iMacs. And yes, there's a teeny-tiny difference in clarity if you lean into the screen and stick your nose 1cm away from it. But at any normal reading distance that isn't designed to destroy your eyesight, the difference on such a retina display is basically not visible. However, the smaller file size makes the file appreciably quicker and smoother to render (even on a fast modern machine) as well as being more economical on disk space. And yes, that's a minor issue on a multi-terabyte computer, but why not be efficient if you can be? I always try to optimise the PDFs I create myself as much as possible, because wasted storage soon adds up, and smaller PDFs just perform better anyway. So I stand by what I said.