The most striking thing about the Trump tax cut isn’t that it was (predictably) regressive; it is the clearly expressed policy preference for capital over labor. As a result of the tax cut, a professional who owns his business has a much lower tax burden than a similar professional who generates the same amount of income, but operates as an employee.
The GOP is very Victorian about the virtues of work as applied to the welfare state, but not, it seems, to its wealthy supporters. The Democrats would be wise to point this out during the 2020 campaign.