Bitbucket is under continuous development - which is great. This inevitably brings need for some breaking changes that might disrupt some customers workflows.
The best way how users would be able to test whether they are correctly prepared for upcomming breaking change (target IP change; removing TLS v1.0 support; API deprecation etc.) is by providing staging cloud for user acceptance testing.
Users will be able to easier prepare for the changes, and you'll be able to receive earlier feedback