But if a new method is needed, servers have to support it (e.g., by updating them to the next version that supports the new method). In the same sense, couldn’t

But if a new method is needed, servers have to support it (e.g., by updating them to the next version that supports the new method). In the same sense, couldn’t that new version “just” not drop the body of GET requests? In any case we are talking about updating servers.