It is possible to edit a zip without explicitly expanding and recompressing (the app is probably doing it behind the scenes, but there's no hassle involved). It's been a few years since I did it, but I think I used BetterZip on my Mac. Actually I think that one of my file explorers may have let me remove things from zips, but that would have been back in 2011-12, so it's hard to remember for sure.