Sometimes it is worth saying the obvious.
A vanilla TW is NOT dependent on anything other than itself.
I think the implications of that are maybe not so obvious immediately!
But, TW can be developed without serious concern for anything a server needs. Whilst TW can USE servers, it is absolutely not DEPENDENT on them.
It is self-creating within itself.
Tiddlywiki is an unusual animal.
WHAT is the advantage? Simply TW is FREE to develop itself without any dependencies.
THAT is a huge thing!
It avoids getting bogged down in excess legacy.
Best wishes
TT