They do, for the simple reason that I don't want to have to click through forms and pages and hunt things down manually to do a workflow. I won't use a cloud provider with a broken or half-functional cli for this reason, and if anybody in any space provides a better agent interface for doing stuff so I don't have to click through UIs, I will switch pretty much instantly.
Think of agent support sort of like food delivery. Once people get used to the convenience, places that don't offer it are at a huge disadvantage.