It’s a textbook example of short-term engagement gains undermining long-term usability and trust.

How so? Is this expanding the potential audience for a creator. If I'm a creator making videos in Thai, with this feature, all of a sudden my videos can be enjoyed by English speaking world.

And from the example I've chosen, English speaking viewers (assuming they come from North America) can bring in more ad dollars. To me, this is a win-win. Creators get new audience, potential for more money. Viewers get access to a large library of content previously unavilable

The issues you highlight are not deal breakers ("I cant find a video that I searched before") - so things can be fixed in due course.