100% true, all of itEven quality chains like EK and RK have shorter lifespans ridden in the wet and not oiled. Not much sucks more at the end of a long day than seeing sticky red dust of death (the factory grease + rust) on your not-sealed-anymore chain.
I street parked and commuted every day without snow between 2012 and 2018 and covered 100k miles in that time, wearing out 5 chains. I followed "don't bother oiling it, not needed" advice for the first few and got 16-17k on average. Then on a hunch I started oiling them after riding in the nasty, and they started lasting a lot longer.
Using oil as opposed to something super tacky, dirt flings off and you don't need to clean it. Sealed chains might not need it as often, but they still do if you want them to last through weather. Your use case or experience may be different but it's a no-brainer for me now.