Yes it’s been discussed before… yes there is a snarky remark by the devs…
/t/download-whole-folders-from-shared-link-as-zip-instead-of-tar/5287
and yet still… macos defaults to archive downloads in tar format… it’s old and outdated… zip support is fine (believe me ;-I ).
Also I sometimes send archives off to other people that don’t use a mac.
Make download archive type zip by default, an option in the settings or selectable before download…
As in the (well not really) linked issue above (5287), if you download multiple files on a MacOS devices a *.tar file is created. As was the case in the issue (5287) years ago, this is stilla nuisance and should be changed.
This is only recommended when you really need it and keep in mind that you’ll have to define an integrity check exception and that your changes will be lost by upgrading ownCloud.