There is a feature I saw in other applications I thought was possible in joplin, until I subscribed and noticed is not possible (yet?), and it is to define a custom alias for your account.
In other apps when you subscribe to "cloud" you can choose a unique name to be used in your URLs. something like <devgiu>.joplin.com and you can set a friendly url too like: <devgiu>.joplin.com/ <this-is-my-note-url>
FWIW You could control that by self hosting your own Joplin Server as you have full control of the domain you use, but you have to setup everything yourself, it is quite technical.
For Joplin Cloud I don't know whether it is considered in the roadmap. I'll let someone else answer.
Yes, I understand if I selfhost I can control the host URL (not right now but maybe in the future), but the other issue is the friendly url to the note.
With Joplin Server you can customize the shared note public link pseudo random suffix to your liking by modifying it directly in the database, I do it for mine.
Extra: Be able to publish a complete notebook (notebook can be a custom folder in friendly-url ) to be able to have our digital garden, a published blog, and so on...
I think is so so usefull and an extra reason to subscribe to cloud. We can talk more in detail about what I shared in private if you wish.