Why is SL sacred?
— A stop-loss is insurance against emotions. Even if you are confident in a trade, the market can behave irrationally.
— Example: You bought ETH on a breakout, but BTC unexpectedly dropped due to news. SL will save you from disaster.
Conclusion:
You can only change your mind based on new data, not because you were "scared". And SL is like a seatbelt: it's better to stop early than to crash.

BTCUSDT
Perp
88,510.6
-1.68%

ETHUSDT
Perp
3,080.73
-0.67%