Started chapter 15 of Capital Volume 1 today: Machinery & Large-Scale Industry
Under capitalism, machines are not designed to lighten the burden for workers.
The role of machines is to cheapen commodities.
Cheaper commodities means more surplus-value for the capitalist.
By the time Marx was writing, machines were an established feature of the world, pre-existing and "objective." The nature & value of work had already been redefined by the machine age