They still have some specific use cases where they aren't obsolete. For example I've worked at several law firms and every one of them had at least one office typewriter. They are super useful when you're working with older documents and want the additions to look professional and consistent. For example I once worked on a complex stock reissue where I was working with 100 year old stock certificates. Typing on them was muuuuuch faster, easier, and cleaner with a typewriter than trying to line up the old certificates in a laser printer