Why Is a Delta-Neutral Portfolio Not Perfectly Hedged against Large Price Moves?
A Delta-neutral portfolio is only perfectly hedged against small, instantaneous price movements. It is vulnerable to large price movements because of Gamma risk.
Gamma measures the rate of change of Delta. A large move in the underlying crypto price will significantly change the portfolio's Delta, requiring immediate re-hedging to restore neutrality, which incurs transaction costs and potential slippage.