You'd be right at times, and wrong at other times.
It's easy to post this now after we've been all the way down to 15k. Of course that would have been a great time to go all in, but that's of course in retrospect. If you'd posted this in November of 2021, you would have steered everyone wrong.
The fact is that DCA takes emotions out of it, smooths out volatility, and for some people will be the difference between selling at a loss, and being able to stomach the downturn.
I think your advice is too one sided and not a very humble opinion to hold.