Now, I'm making some assumptions saying this, but:
I think we do good to consider that the Stride Development/Management Team and the Bamboo Development/Management are likely two separate groups of people (and likewise with JIRA/BitBucket). With this in mind, these latter folks may have had no influence of when, and bearing what features, HipChat is being forcibly replaced with Stride. This means their existing plugin instantly becomes obsolete and new work is automatically piled onto the Backlog which doesn't create any cool new features, it just restores a pretty elaborate existing one. Being a developer myself, I know that scenario would be extremely frustrating to me.
This all being said, I hope the launch of Stride happened in coordination and cooperation with these other teams, and I hope the Stride team is prioritizing support for their fellow Atlassian colleagues.
I'd love to hear from someone at Atlassian whether this is close to or far from the truth.
Hi everyone,
Thank you for your votes and thoughts on this issue.
We believe the best way forward for our customers and for Atlassian is to enter into a strategic partnership with Slack and no longer offer our own real-time communications products. See full announcement here.
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Bamboo Team