I develop using Dev Tools set to mobile and throttled connection. This way mobile-first responsiveness (limited screen-estate) and potential problems with bad connections are first class citizens.
Now, what usually happens is that I signal problems to the product owner and they wave them away. So I might update your third point that sometimes they do test it on their father's old 2010 family PC but it's not of concern to more relevant stakeholders.
I develop using Dev Tools set to mobile and throttled connection. This way mobile-first responsiveness (limited screen-estate) and potential problems with bad connections are first class citizens.
Now, what usually happens is that I signal problems to the product owner and they wave them away. So I might update your third point that sometimes they do test it on their father's old 2010 family PC but it's not of concern to more relevant stakeholders.