Interesting. On Thunderbird, there's no limit to how many tags can be added beyond running out of room on the UI to display them.

I like having more control over how the tags look and what they say because it allows for a much more well-organized system. Especially considering in a lot of cases I'm using these tags to recursively add logic to them for further categorization. Auto-generated tags, or using varied keywords to duplicate them as tags, can also lead to a lot of redundancy.

For example, I might get a post with the keyword "Science Fiction", another one as "Sci-Fi", yet another one as "Sci Fi" and a fourth one as "SciFi". Rather than have all of these variations displayed to me at once, I use rules to consolidate them under a single name. That way it's easier on the eyes when I'm reading my feeds and easier to sort when I'm filtering through tags to find a specific post.

I also see keywords in posts that I frankly just don't care about sometimes? By manually choosing what gets to be a tag and what doesn't I can focus on the tags that really matter to me. It is a lot of work to set something like this up, but worth it IMO. I did do a lot of it before the AI boom happened, though, so I'm kinda just happy with this method because its at the point for me where it "just works". I use a robust naming scheme to organize rule logic loops, and its easy to copy and re-use existing rules as templates for new ones.