This is the whole point of a book I'm reading called "Capablanca: A Primer of Checkmate", basically it's about the usefulness of a threat of checkmate.

Ignoring the fact that you could mate a weak player with this, you can take a knight. That's not nothing. That's a lot. And you could take that knight even if you were playing against Magnus Carlsen, there's nothing anyone can do about you taking that knight, because they would lose the game if they tried. (not that Carlsen would get in this position in the first place, but y'know.)

For a long time I thought knowing elaborate tactical checkmating patterns was fun but ultimately pointless, because any look at an engine will show you that most games just don't ever end up in a position with a forced mate in the middle game. But a mate does not need to be forced to be useful. If you recognize all the ways you could give mate, you can force your opponent to be your bitch as he tries to avoid it. Even if it's an avoidable mate, what does he have to do to avoid it?

Sometimes the only way to avoid the mate is giving up his queen, sometimes the only way to avoid it is -- as in the picture -- letting your queen take a knight and not touching it.

So it doesn't matter that if he's a strong player he would be able to avoid mate, what matters is what you could get out of him. basically, fully understanding mating sequences is important not because forced mates are so glorious (they're too rare to be relevant, IMO, by the time you get an elaborate forced mate you almost definitely have a regular mate just around the corner anyway), it's because the threat of a checkmate is extremely powerful.