In classic, we have implemented streaming group (SERVER-70267), which is group id order preserving due to the conditions when a query is eligible for streaming group.

This order preserving property can benefit further stages after a streaming group, eg a sort on the same order.

Post group sort is often used with $limit/$skip to support pagination of results, for example as modelled by this workload:

https://github.com/10gen/PrivateWorkloads/blob/production/src/workloads/customer_representative/coinbase/timeseries/GroupDateTruncLimit.yml

Eliminating the sort would greatly improve query performance.

When SBE supports streaming group, the same post group sort eliminatino also applies.