KatanaV3Pool, KatanaV3Factory, and NonfungiblePositionManager implement custom initialization functions without using standard initialization protection mechanisms like OpenZeppelins Initializable contract.
The contracts use custom checks to prevent multiple initializations, such as checking if certain state variables are set to their default values. While these checks do provide some protection against multiple initializations, they dont follow the widely accepted standard of using an initializer modifier. 
The current implementation, while functional, deviates from best practices This could potentially lead to:
While the current initialization checks provide basic protection against multiple initializations, adopting standardized initialization patterns would enhance the contracts security, readability, and maintainability.
