BUG: Series constructor not respecting CoW when called with BlockManager
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BTW we should deprecate accepting managers in the constructor and wean 3rd party libraries off of it > BTW we should deprecate accepting managers in the constructor and wean 3rd party libraries off of it

If we want to pursue that, I think it would be best to start with proposing and implementing an alternative option to use, since we still need _some_ way to do this for both advanced users (like pyarrow) and subclasses (they need to be able to customize this constructor from a manager, xref https://github.com/pandas-dev/pandas/issues/51772)

(I personally don't have a strong opinion about this. I think it would certainly make sense to have a separate constructor if we were designing it, just not fully sure it is worth changing now) Addressed all comments, will merge to get in. 