In the Atlassian support article, updated April 2023, Best practices on using the "Resolution" field it says
There are many native functionalities in Jira that depend on the "Resolution" field. Some of them are (and they are not restricted to):
- Issues having its key strikethrough on boards;
- Reports about issues (for example, "Created vs resolved");
- System filters (for example, "Open Issues").
Well I know that used to be the case but I have tested the behaviour and now see that the first and third on that list are now driven by the Status Category and NOT the Resolution. This is a detrimental change in my opinion but it begs the question, what is the Resolution field now for,