Well... If you are already in a situation for Cross-Over (time pressure), then you would never take the ball at smash height, but let the ball drop to around net height (gives you more time to get into position) and loop, not smash.
So I assume, you also view the shown smash technique in the first video as irrelevant and simply wrong, do you?
there is different reasons to be hitting the ball at different heights
the OP video is a tutorial video.
In turns on learning, you need to learn everything.
how you play is a different story, but you need to have every skillset in the stable.
I see nothing wrong to learn to hit the ball high, so to me, it is not irrelevant.
This is just like me training girls to pivot. In real life, they won't pivot.
remember, when you let the ball drop to net height, you also affording your opponent the time to get ready for the incoming ball
or I can also add, rather just let the ball drop below the table and do a snake? lol