If I am working on something simple and want the speed boost then I'll drop the thinking to low or minimal and still get the SOTA model output quality.

But for what I work on I mostly need high or xhigh SOTA model quality output. I don't have the time to deal with anything less.

This! I've found that for most coding, Sonnet is pretty good as it is. Yeah, you might need to finesse your prompt a bit more, and you'll probably be spending a bit more time on the computer, rather than a more hands-off approach, but at the end of the day, you'll save a lot more simply because you're using a good-enough model.

If you're the one-shotting type, obviously then Fable might be useful, but I think only marginally. You don't need to bring a MANPADS to a duel at high noon.