This was a massive upgrade from 0.19.3 to 0.19.4 and finally to 0.19.5:

0.19.4 Patchnotes

0.19.5 Patchnotes

The change with most user impact is that everyone can now see how many upvotes & downvotes a comment or post (hover above the vote count) has. Previously only the sum of all votes was shown via the default lemmy UI.