This is called an identity first workflow and is used specifically so that they can route different people to different login ceremonies or providers.
They get your id first, and use that id to determine what your login ceremony is. Perhaps you’re with a business that they have an sso integration with and will send you on to your businesses sso provider, or perhaps you’re a local user for them and get a password screen next.
Do it! I work in the industry and have found it to be very effective in conversations spanning varying levels of technical expertise.