I think the problem is the fact that then there must then be two Copy-and-Paste-symbols which would probably unsettle rather than benefit more users. I think /download can be remembered. But I think in the beginning I always called the share first and then copied the download link.
Yes. My fault. In the menu i think there would no problem. But maybe it is not a nice Copy-and-Paste-Button.
Yes. But i think Nextcloud is more a sharing platform and not a web space or CDN. Look app Sharing Path. Sometimes i use the one file filemanager Tiny File Manager. There you can use the admin tool (tinyfilemanager.php) outside the data directory, deny directory listening and direct link to all uploaded files without database, … Look the demo and example image. But Nextcloud has a different approach. I don’t know if it would be good to allow thousands of calls to the same file via nextcloud shares.
Yes. But i think the most user do not use it. But you can write an issue see my link above.