All good points, but FP has been a solid paradigm for a very long time, from people that had time and wisdom. It reduces very quantifiable issues like shared mutations, lines of code.

Now that doesn't make js revisitation of fp pristine but still it's quite a refreshing thing.

I never used Ang2+ but Ang1 was such a heavy thing; it was a OOP theory in itself, flipped around the DOM (I forgot their terminology but basically, the DOM tree became the inheritance tree).