The creator of litecoin Charlie Lee supported it, talked with the necessary people and implemented a plan that no one had any real issues with hence it was approved sealed and a done deal.
https://www.cryptocoinsnews.com/litecoin-creator-charlie-lee-urges-jihan-wu-to-signal-for-segwit-antpool-obliges/
(Also the transaction capacity was not near the 1MB limit yet so a lot less impact they have more time to study things later)
Bitcoin the foundation and other groups suggested it met pushback and hence we had a blockscale debate on the best implementation due to a variety of political monetary and strategic issues that scaling presented and the transaction limit was approaching so issues and debate hence drama.