Are travel blankets actually worth packing for a flight?

Across r/onebag and r/HerOneBag threads we read, the consensus is yes if you're cold-sensitive or fly long-haul, especially in airlines that no longer hand out blankets. Many travelers note they double the blanket as a scarf or wrap during transit so it doesn't eat carry-on space. Light packers who run warm tend to skip them in favor of an oversized scarf.