First I have to excuse. When I read more posts later, I saw, that most of my wishes already have been covered by other posts. If I had read them before, I probably had not written.
If I open a link, I only get a finder window, which shows the position of the file. It was a normal text file, as far I remember. My idea was, it could be open directly with the associated app or an open context menu („open with“)
Yes, attachments are indispensable, as you may see reading the other feature requests.
Cooperation with other task managers (things in my case) would be also desirable, but I am not sure, if it is so easy to realize and if it is dependent on the agreement of the companies who own that apps. May be, a first approach could be, to use clipboard.
Nice for further future would be a connection to several bug tracking tools like Jira, Youtrack, etc. via the ticket numbers, so I can refer to the tickets directly from agenda.
Including tables and a simple project related Kanban board would also be useful in my point of view.
Thanks so far for your efforts.