I agree for the most part that you should explain the "why not what" but of the four things you list above, you might argue that
What it does - agree
System interconnection does not belong in the comments unless it that part of the code is orchestrating the interconnection and the code is unable to make that clear. Comments like "This will be use by x for y" may not be useful as other components using this code may change what they do leaving the comment stale.
Product usecases are really not appropriate for a comment in my view unless they are used directly to build/generate the documentation (for example using a tool like Docular).
Changes over time - If done wrong this can leave a lot of stale information in the source that someone skimming over might draw incorrect conclusions from. If it is felt there is a need to write this is the code in comments it suggests to me that the commit log is not being maintained well for that code. Good commit log messages leads to a good story of what changed and why. I'd argue that writing good commit messages is more important with respect to changes over time.
As a side note, for this if using git, learn interactive rebasing... it is in my view the path to a readable commit log.
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I agree for the most part that you should explain the "why not what" but of the four things you list above, you might argue that
What it does - agree
System interconnection does not belong in the comments unless it that part of the code is orchestrating the interconnection and the code is unable to make that clear. Comments like "This will be use by x for y" may not be useful as other components using this code may change what they do leaving the comment stale.
Product usecases are really not appropriate for a comment in my view unless they are used directly to build/generate the documentation (for example using a tool like Docular).
Changes over time - If done wrong this can leave a lot of stale information in the source that someone skimming over might draw incorrect conclusions from. If it is felt there is a need to write this is the code in comments it suggests to me that the commit log is not being maintained well for that code. Good commit log messages leads to a good story of what changed and why. I'd argue that writing good commit messages is more important with respect to changes over time.
As a side note, for this if using git, learn interactive rebasing... it is in my view the path to a readable commit log.