We already have POST, PUT, and PATCH that do the exact same thing. Why not have another version of GET that looks the same as POST and is subject to personal interpretation.

FYI: QUERY is for GET requests where the query string make the URL too long. It does this by sending a body like POST.

In the past, POST meant you were sending a body, and GET meant you received a body. And the people got religious about a pseudoacronym called REST.

Apart from the sectarian conflicts about what REST means, having a HTTP method that proxies can cache like a GET but allows bodies is pretty useful from a purely practical standpoint. You can do this with POST, but it requires proxy-specific configuration.

The point of the HTTP verbs is to communicate expected behavior. While a server could treat POST, PUT, and PATCH the same, the point of having the verbs at all is to give a standard way to signal clients what is going to happen. While a server can ignore the expectation, it doesn’t mean the expectation isn’t valuable; it allows conforming implementers to communicate what is happening using standard language.