But, I am super lazy.
Owning a project is counter-productive for QA. If it’s your project, you know where to click and where to not click.
OTOH, you don’t need to know anything about a project to conclude that a crash with access violation, or hang with 100% CPU usage, are clearly bugs.
It's not that he has some inner urge to contribute in some way, he just encountered a bug while using the software and wants to report it. The alternative isn't coding — it's no contribution at all.
Of course anyone can make a mistake. Maybe you prefer the 'discussions' route because it's only seemingly then possible for a projects own devs to make a mistake in creating an issue.
At a high level - the audience of discussions is the community at large, the audience of issues is the maintainers.
What Ghostty is doing with a dedicated category for issue triage should work just fine, despite it being an additional hop.
Unless you only ever work on projects that you have full absolute control over (unlikely if you have a job) then yes they absolutely are.
You can clone the other person’s apartment for free and do whatever you like, though. Just don’t barge in to someone else’s apartment and demand they treat you, a stranger, like if it were yours.