You're wrong that nobody's heard of these things and that they aren't in the news. Pick up the NYT or Fortune or any moderately substantive source. These issues have been discussed all over for decades, and they came up again repeatedly in the context of the BBB. QSBS and SALT came up because of their expansions, and carried interest came up because Trump promised to eliminate it but didn't. I didn't go digging for this information. It was handed to me.

More importantly you're wrong that people only think of tax cuts in terms of marginal rates, and that they need to know about specific schemes like QSBS and carried interest to include them in the broader idea of tax cuts for the wealthy. People have a general awareness that such schemes (popularly: "loopholes") exist and benefit the wealthy. The names of the schemes and how each one works don't matter. People know they exist and what they amount to.

So: The idea that people don't know about specific tax schemes used by the wealthy, and therefore don't think of these schemes as tax cuts for the wealthy, is wrong, and the idea that people need to know about specific tax schemes used by the wealthy in order to think of those schemes as tax cuts for the wealthy is also wrong. The first is wrong empirically, and the second is wrong logically.