You're using it within their high usage rate window. I hope you're aware of this, if you use it out of the high usage time window it's supposed to use less, but it does seem a little odd that Sonnet uses so much, even on Medium.
Please. This is a toy. A novel little tech-toy. If you depend on it now for doing your job then, frankly, you deserve to have your rug pulled now and then.
If you didn't found the way to use the tool constructively, keep trying.
If you didn't try to use it to work for you, that's okay, but maybe try once more? It does work and adds value. It's a non-standard and weirdly flexible tool with limitations.
...but in retrospect, seeing how you finished your comment, maybe you really want to remain angry and misinformed.
