Why is it said that trend following on long timeframes is effective

The idea of following the trend is

different from contrarian trading

losses appear first,

then profits accumulate later—the logic is

and

shorter time frames have noise plus profits not being large in pips

these are the drawbacks

Longer time frames have less noise and when they run, pips are larger

these are the advantages

In contrarian logic

profits come one after another, and you reach a market where you must take a loss at the end to escape

Even if you decide to cut losses with a break at support/resistance,

the losses simply accumulate, and even if you keep making profits, those profits are offset by the losses

As a result, you cannot fully leverage the contrarian logic and end up negative

In other words, contrarian logic

to counter a market where you must take losses, all profits get offset and more losses accumulate

No matter what measures you take, at some point a big loss will occur

In the case of trend-following, since it is the opposite version,

even if losses come one after another, profits appear at the end, so the overall result increases

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