Disagree, a trend is not a trend, check out trend metrics 20 years ago, then 10 years ago, then 5, then recently. You will spot a pattern. I guarantee you because I have put in the time to analyze it already.
Well I could say glibly a trend is a trend if my trend-following strategy can trade it as a trend. But as vanilla trends still occur on charts and still look like trends and act like trends, maybe the best I might accept (but not without evidence) is that trends might be less common and less prolonged than they used to be. Then again, for all I know, they might be more common and more prolonged than they used to be.
But if you do have some data to the contrary, why not let's see it.