I think that MMT is an interesting reframe with two major truths: (1) It's the real economy stupid, and (2) monetary/fiscal policy is just fiat power by abstracted means.
My interactions with their community have been pretty poor so far. It seems like MMT is adding epicycles to essentially do automatic Keynesian spending (via jobs guarantee, etc.) / taxing the rich / externalities.
That said the idea that printing money != inflation and that we shouldn't think of the national debt as a complete limiter seems to both be true, ie the real economy / productivity actually drive what you can spend and modest inflation could be kept within limits.
My fear though is that they don't have "advanced" FAQs that I've seen. Nothing addresses: the affects MMT would have on dollar as reserve currency, what their assumptions on the limits of MMT to gov't spending actually are, how governance could limit political meddling, etc.
Also... what jobs? Covid is killing the biggest low-skill service sectors dead. Retail etc. My hair clippers are being delivered now, I might be permanently exiting the haircut market.
There's plenty of jobs we could do. Their jobs guarantee idea would have gov't jobs created automatically during downturns, but the issue I have is that there's no policy I've heard them describe that has accountability for those programs.