Quilt packages are one level of abstraction above S3 object versions. Object versions track mutations to a single file, whereas a quilt package references a collection files and assigns this collection a unique version.
It is strongly recommended that you enable object versioning on the S3 buckets that you push Quilt packages to. Object versioning ensures that mutations to every object are tracked, and provides some protection against deletion.
Yes, to find bugs and prioritize features.
You can disable anonymous usage collection with an environment variable:
$ export QUILT_DISABLE_USAGE_METRICS=true
quilt3.disable_telemetry() to persistently disable anonymous usage statistics.