SOP's a re a foundation on which can be built.
Initially experience is gained following SOP's to the letter, this is what initially is taught in line training and acts as the best foundation for flying when released from training.
It then takes years of experience, learning from different highly experienced motivated captains to learn good airmanship and variations to SOP if required in the interest of safety.
SOP's cover 99.99% scenarios, some however fall outside them, these are learnt by flying and being presented with them the flight line.
There is not always a right and wrong in things either, but only one method is taught initially, to keep you and your colleagues and passengers safe.