Maybe it's just me, but I feel like monitoring software failures should not cause application failures.
In theory things shouldn’t break but if your CI process involves signaling a third party, it can fail from that (hopefully you can temporarily disable it or something of the sort)
I prefer a 98% accurate error reporting better than a 100% one I can't push to production.
Or maybe I'm not understanding well the value Sentry offers, of course.
I think if your release cycle is longer, then you will prefer not to deploy without sourcemaps.
Edit due to other comment: this assumes CI/CD. If you were deploying only weekly then this might be good reason to delay