The exact same thing happened with Reaganomics/Supply Side Economics. The economic brains behind these ideas was Milton Friedman, and while he did strongly and aggressively advocate for supply side economics, he also had quite a lot about to say the consumer side of things and advocate for, among other things, a negative income tax [1] that in practical terms is essentially a basic income that solves many of the major problems with things like welfare.

I'm not advocating for a basic income (or supply side economics), but simply emphasizing that what you said is completely true and one of the many risks of MMT. Even if MMT might be theoretically viable, in practice it's going to be interpreted as something not far from a pseudo-intellectual justification for arbitrary levels of debt/monetary inflation.

[1] - https://www.youtube.com/watch?v=xtpgkX588nM