Ubuntu linux is a distribution, and only a very very small set of tools and functionalities is "Ubuntu", all the others are simply packaged up 3rd party tools
It's a big strength of Linux distributions. There is one central, easily reachable place where you can report and track bugs for pretty much everything you do on the computer.
Obviously there are no guarantees that things will be fixed (fast) if you don't pay some sort of support but that's fair enough and still, the maintainers usually want the stuff they package to work reasonably well (they wouldn't spend their time packaging it otherwise) so one can expect a minimum level of functionality for most things unless explicitly stated otherwise.
The supported area for Windows and macOS from Microsoft and Apple is small in comparison to BSD and GNU/Linux distributions and good luck reaching them anyway.
It's reasonable to have unfixed bugs for years if they are not really blocking many people (and even if they did, but that would be too bad). Maintainers are focusing on other things that need to be done (or not, anyway nobody is supposed to fix bugs for free if they don't want to).
In this case, launchpad works as intended, as a place were you can track the (non) progression of your bugs.
Me too, probably, by the way (in other projects). My bugs reports are more like FYIs to the community.
It's almost ;) as if Apple doesn't care if real UNIX people prefer their laptops anymore.
Apple has moved on, to a bigger and far less demanding market: "real" people who have never heard of the artist formerly known as UNIX.
I don't think any are. From a quick glance, everything should be included in Ubuntu's officially supported "main" section.
In my case I use sshfs, which also uses FUSE and is a "3rd party tool". Is that more reasonable than osxfuse? (Honest question, I'm unfamiliar with the latter)
edit:
sshfs is "unsupported": "However, at present SSHFS does not have any active, regular contributors, and there are a number of known issues (see the bugtracker)."
Apparently this supports a bunch of other "virtual filesystems", like Google Drive, as well.
Since it's part of Gnome, I guess it's fair to compare this with MacOS and consider it "woking out of the box".
Only thing app that wasn't working well with gvfs was libreoffice. I don't know if it is still the case but it refused to handle a file gvfs mounted on my NAS regardless of the protocol (ssh, smb, nfs).
I have severe problems with osxfuse on M1: janky behaviour and system crashes. This stuff should be native.