Because Front-running is a key aspect of AMM design, deadline is a useful tool to ensure that your tx cannot be saved for later.

Due to the removal of the check, it may be more profitable for a miner to deny the transaction from being mined until the transaction incurs the maximum amount of slippage.
File: /paraspace-core/contracts/protocol/tokenization/NTokenUniswapV3.sol   #1

51       function _decreaseLiquidity(
52           address user,
53           uint256 tokenId,
54           uint128 liquidityDecrease,
55           uint256 amount0Min,
56           uint256 amount1Min,
57           bool receiveEthAsWeth
58       ) internal returns (uint256 amount0, uint256 amount1) {
59           if (liquidityDecrease > 0) {
60               // amount0Min and amount1Min are price slippage checks
61               // if the amount received after burning is not greater than these minimums, transaction will fail
62               INonfungiblePositionManager.DecreaseLiquidityParams
63                   memory params = INonfungiblePositionManager
64                       .DecreaseLiquidityParams({
65                           tokenId: tokenId,
66                           liquidity: liquidityDecrease,
67                           amount0Min: amount0Min,
68                           amount1Min: amount1Min,
69 @>                        deadline: block.timestamp
70                       });
71   
72               INonfungiblePositionManager(_underlyingAsset).decreaseLiquidity(
73                   params
74               );
75           }
76:  
