I still use a 1x9 setup with derailer and have freezing issues at times in the winter too, but it's not often enough to be a real concern for me. I like the IGH idea as it just makes a cleaner bike with less hanging out and a shorter chain. For now, I have started using Marvel Mystery Oil in a spray can recently as a trial on my chain and derailer because my usual chain lube was not staying on there after I rinsed the bike off with a water hose and put the bike away at the end of a messy commute and it always looked bare and rusty. It seems to be adhering well and my derailer has been shifted ok since.