Yeah I'm not saying immutability solves the problem, I am saying that having good support for immutability is helpful for building those synchronization and rol

Yeah I'm not saying immutability solves the problem, I am saying that having good support for immutability is helpful for building those synchronization and rollback systems. If I thought immutability was all you needed I wouldn't be bringing up the effects system & pointing out how current languages still fall short in my own experience.