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Point 1: I do need to update the screenshot and directions for that tutorial. "By Column Requirement" is most useful when you define a column set, and you want to choose which columns in the set are updated by a certain event.

Point 2: Since it is the Statistics Collector tutorial, it does not describe how to write queries that produce data suitable for charts; that would require a long discussion on update modes as well as chart data formats, which seems out of scope for this tutorial. There is reference material for each chart that explains how the data should be formatted, and there is reference material on the Calculated Table update modes, and how they work.

Point 3: Step 5.6 says to include the Input and Output columns. It does not say to include the Object column, which the chart above does. I will make this more clear in the tutorial.

Point 4: The chart type in the step is correct. The Pie Chart and Bar Chart draw tables with the exact same data format, so a Pie Chart and a Bar Chart can both draw the same table. The Pie Chart just wraps the bars into a ring instead of displaying them side-by-side on an axis. The instructions, however, need to elaborate that you should set the Pie Title, rather than the Bar Title, to Object. Otherwise, the steps are identical.

You posted it in the right place. These concerns feel mostly like bugs, and can be shipped without any backwards compatibility notes or new documentation. A bug is more "I tried this and it was confusing or didn't work", where an improvement or feature is more "I want the software to be able to do something that is extremely difficult more easily". Those are better for ideas.

As far as making it private, the only time I recommend making things private is if it contains sensitive customer information or models. For bugs, I want customers to be able to find the question, so that if they have the same question, they can see the answer.