This pattern isn't new per-se. The industry already went through it when moving from DHTML to XHR, and it was (mostly) abandoned for good reasons. Modern DOM patching techniques gave rise to some newer variations, but they still make the same old trade-offs. They don't really solve engineering issues like tight coupling and brittleness, nor network issues like latency and larger payload volume.

So, to me, this feels more like an effort to offer a more affordable solution (in terms of engineering cost) for small-/mid-sized companies, rather than a push to expand the boundaries of the technology. Not a bad thing, but it's just a bit disappointing to see history kinda looping back on itself.