"The tech necessary for steam engines was available by the late Roman empire" I read here on HN that this might be not really true. Because the romans did not

"The tech necessary for steam engines was available by the late Roman empire" I read here on HN that this might be not really true. Because the romans did not heavily invest into high pressure chambers, aka cannons, like it was done in medival times. You don't just need a metal pot to build a steam engine. They must be able to hold much pressure and if they don't, they explode. So the romans likely would have been able to make it work, but it would have required a significant investment - as they did not had experience in building pressure chambers.