It's encouraged in Australia, at least in the arts. Perhaps different disciplines have different rules, rather than it being a country-based thing. I've used countless textbooks from both US and UK over the years, and haven't noticed a difference. Why do you think US teachers don't like it?
It's hard to win if you're a student though. You have to do it, and then you're subject to criticism for needless repetition. It's onerous to follow the advice to "tell the reader what you're going to say; then say it; then tell them what you've said", and do all that within an unrealistic word limit.