All websites had all incentives to be api-first for 2 decades now. They aren't API first not because they can't - but because customers will use whatever GUI website supports to use it. Unless your product has no value - users will fill out those forms manually if you don't provide API if they need your product. Agents don't change this.
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 deliv…
You will if they have what you need and others don't