Parent comment seemed to suggest that (much) higher pressure produces better espresso and my comment had a sole intent, at the expense of simplifying some thing

Parent comment seemed to suggest that (much) higher pressure produces better espresso and my comment had a sole intent, at the expense of simplifying some things, to give some grounds why espresso manufacturers might use higher than 9-10 bar pressure at the pump. Gaggia Classic is a 350 EUR machine whereas Rancilio Silvia is 600 EUR machine. These are not entry level machines. They are entry level for someone becoming more interested in espresso but not for ordinary people. And ordinary people do not spend 400-500 EUR for a coffee machine if they think they are going to get the same for twice less money. Twice less money machines do not have OPV.