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Hm, looks like deprecation.py is used by repos outside of Terra, like

https://github.com/Qiskit/qiskit-machine-learning/blob/89eac3b39924ebfdcbb2b05a22d70e745e791c09/qiskit_machine_learning/neural_networks/circuit_qnn.py#L51-L58

So, the pending: bool change is not safe. It would need to be done via a deprecation, which has some overhead.

This PR was the first of several improvements I was hoping to make in service of #8600. I'll mark this as WIP and regroup. Sorry for the noise!

Pull Request Test Coverage Report for Build 4195565630

• 9 of 11 (81.82%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.002%) to 85.271%

Totals
Change from base Build 4194805799:	-0.002%
Covered Lines:	67230
Relevant Lines:	78843

💛 - Coveralls

As you noted we use the deprecation util in the application repos as well. I will also point out that the set of changes done by this PR, around the algorithms, is also changed by #9532 which is intended for the next release.

Thanks for that context, @woodsp-ibm. @manoelmarques and I DMed about their two open PRs - I'm going to put up soon a prework PR that builds off of their deprecation.py changes, then help adapt the PRs to use that.