Earlier quoted context omitted.
"Power users" are more often than not the ones doing the all arguing. HN and Reddit are the best examples of that. People who just buy the newer version of their favorite phone don't even care enough to argue. Even the people who care too much about blue or green bubbles don't give a damn about which phone has more RAM or CPU, or which OS is better, or UX, or whatever. They never stop to compare.
You could say in a sense, people who care about whether the recipient of a text has imessage do care about UX, I just wish the avg person understands that most if not all of the features and consistency imessage provides can be achieved with signal or whatsapp.
Of course normal users care about UX, even if they don't know what the acronym means.