Pluggability

# Summary

Issues:

* [x] #4355
* [x] #5201
* [x] #7154
* [x] #7177
* [ ] #7710
* [ ] #6945
* [x] #5862
* [ ] #6867
* [x] #7073
* [x] #6313
* [ ] #4162
* [ ] #4163
* [ ] #7743

Related:

* [ ] #6615
* [ ] #4158

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**Message from the maintainers**:

Impacted by this bug? Give it a 👍. We prioritise the issues with the most 👍.

The issue contains only a pluggability summary and a checklist of related issue numbers; it names no files, tests, or entry points. Start by reviewing the linked issues, especially the unchecked items, to determine the intended scope and identify the affected subsystem. Done is not defined until the checklist and a concrete acceptance criterion are established.

Written by the indexing model from the issue text.