Yes, but proper, technically superior ways for "data binding" and templating were around since IE6 era, just back then people were not concerned much with doing things properly with javascript as the universal presumption was "if it uses JS it will be slow invariably of amount of efforts put into it."

That’s not the case with RE:DOM, since you have a single update function to make pure updates.

I usually create a requestAnimationFrame debounce to have just a single render per animation frame.

His point is that writing the single update function becomes complex when you have lots of changes to apply.

The beauty is that you know exactly what’s happening and when.

Debugging is also way easier without long stack traces.

There’s pros and cons in everything.