I think there's an important missing piece in this conversation that seems to have gone into a battle between templating engines.

One of the key features is being able to save/tweak/fork and share the templates visually (using the block editor).

Another missing piece is that the html as written today is already dynamic. Blocks are dynamic. There's no difference between a block HTML comment and say a twig token, both can augment HTML with dynamic features, the difference is that the blocks comments can be edited visually while for the twig tokens, you need to write code.

Does this mean this issue could be solved by just having some "inline blocks" or "inline tokens" that the editor can understand somehow, maybe? maybe not? I don't have a precise answer now, but editing capabilities is an important piece of the puzzle.