new comer's queries

i am just new and zero for coffee and you may laugh on my queries found to be silly but please reply seriously. i opened a discussion titled 'barista with/without a machine' few days back,and thanks to all those who replied and who couldn't. all most everyone humbley denied the credit to man behind the machine ie 'barista' for a good cup of coffee.now my question is , 1-if this true then why we all talk of good grinder and machine and never talk of fully automaticmachine that contain grinder also and are planned for different coffees including espresso 2-how material(ie copper,steel,alimunium etc.) of boiler make the difference to coffee

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