I wrote a post explaining the reasons for building this when we already have multiple third-party SaaS providers: https://crbelaus.com/2024/07/31/built-in-elixir-error-report...
It boils down to simplicity. While error reporting is extremely valuable for most projects, it is absent from many. The most common reason is that this requires entering SaaS territory. Most solutions are provided by third-parties that require you to subscribe and pay for the privilege of tracking your errors. Cost is the main noticeable downside. Data protection (GDPR, HIPAA, etc) is another.
The Elixir community is providing great feedback and it was covered both in a YouTube video (https://youtu.be/TNmSVjGyZx0?si=yd6kOwa2ZpxUyFad) and a Podcast (https://podcast.thinkingelixir.com/215).