At the same time there is TiddlyPWA[1] which helps with syncing and some other stuff out of the box.

Now a theme you might be noticing is that there are distributions of TiddlyWiki and various ways to install and use it, it's similar to Emacs and Neovim in this regard.

That being said I was into it for a while and while it's great and even more flexible than most PKM software it takes a certain kind of tolerance for "jank" (as in eurogame jank) due to TiddlyWiki being a living system much more similar to Emacs, in that regard Obsidian and ZimWiki are practically related compared to TiddlyWiki. Because of this the sky and the time you're willing to put in are the limits for TiddlyWiki, it's one of the things where it can be both a canvas for your creativity and your second brain (or flavor of the month term for off-loading some cognitive burden to a system).

Also the community[3] is really helpful over on their forums, I encourage people to reach out if they need help because a bare TiddlyWiki is pretty confusing.

Oh and don't be worried about system lock-in or something like that, if you give it a try like I did it's easy to migrate[4] your notes/tiddlers afterwards.

To be clear, I went through a phase of trying different systems and org-mode for Emacs remains good enough albeit with its own troubles. Between them I prefer the mobile experience of TiddlyWiki but Emacs and respectively org-mode leads to easier and faster capture (of thoughts, bookmarks, todos).

[0] https://groktiddlywiki.com/read/

[1] https://tiddly.packett.cool/

[2] https://mosmu.se/

[3] https://talk.tiddlywiki.org/

[4] https://tiddlywiki.com/static/How%2520to%2520export%2520tidd...

That being said, its hackability and extensibility are hampered by being based on an incredibly crufty template/scripting language. I've never been able to do anything useful with it before running into limitations or bizarre behaviour and eventually giving up.