I've been using it for years now and it's obvious that Smithay and Niri are high-quality projects, I haven't had any issues other than missing features (more of which has become available over time).
As a maintainer I'd still want to review PRs myself before merging, no matter how many random people did it before me.
As a contributor, I'd hate for a random with shallow understanding of the problem/project to come in and tell me I had to change stuff or say my PR's no good, in the chance that the maintainer is easily influenced by strong internet opinions.
Linus Torvalds doesn't review all changes he merges, how do you become a comaintainer if not assisting with maintenance?
If you can't review, don't make a PR (or something).
That said, the other big benefit for me is it breaks a lot less often than hyprland and its ecosystem seems to (and I don't just mean bugs here, I also mean things like config file format changes). And this isn't a slam on hyprland - I was only ever mildly annoyed by its breakage.