What is the best practice related to using the Default Update Set for moving customizations between instances?

Submitting a Default Update Set to an application repository is not a recommended practice for deployment, as it lacks proper version control and management.

The Default Update Set is intended for system-generated changes or very minor, temporary local changes, and it automatically captures all changes without selection. Using it for migration makes it difficult to manage and track specific customizations, increasing the risk of missing updates or introducing unwanted changes when moving between instances. Instead, named update sets should always be used.

There is no such best practice or technical limitation to keep the Default Update Set to a maximum of 20 records; its use for migration is inherently problematic regardless of size.

While update sets can be merged, merging Default Update Sets before moving is still not a best practice; the core issue is using the Default Update Set for planned migrations at all.