That is exactly right! Journaling / Tracking / Diaries is a vast topic in itself. Journaling as “written conversation with oneself” had been going on for a long, long time before the net even existed.
Loading up tiddlywiki.com with that complexity is unworkable. Far better an enthusiast develops a journaling “edition” that acknowledges the variant methods that have been used to provide a flexible system. IMO, that would be wholly dedicated to Journaling. There is no way TW central could incorporate, given other things it needs do, the full scope of Journaling methods or objectives.
FYI I think you own approach is testament to the wider need amongst potential “Journal Writers” for examples. I thought it relevant to that!
My 2 cents
TT