I agree with you that this is a very strong sentiment. People don't want everything to change all the time underneath them, especially not the UI. But freezing

I agree with you that this is a very strong sentiment. People don't want everything to change all the time underneath them, especially not the UI. But freezing everything for years puts too many people in a situation where they just have to upgrade for one reason or another. It's not always their choice and it's rarely a desire for change that makes them do it.