Most of what you stated regarding offshoring is incorrect. The manufacturing industry was on a steady rise prior to 2016, and continued that trend until COVID. We are still well below pre-covid numbers. While a few companies were bringing jobs back, almost all of them were already doing this prior to 2017's tax changes. Many did not because the increased tariffs raised the cost of materials substantially. They could have used that money to pay for the higher cost materials and bring jobs back. The real thing that happened was that most of these 'savings' were redistributed in the form of stock buybacks. One could say, yes, people benefited from this, except that MOST people are not in the market so who benefited was still a select few. There were a few companies that gave their employees 1 time bonuses, and even fewer companies who gave their employees raises, or increased job numbers.
Also, while it is correct we have not seen exactly what the tax cut has done yet, and won't for awhile, historically, you are inaccurate. It has NEVER worked as intended. This is a reality that a certain side of the country constantly pretends is a thing.
As for spending. Completely agree. Spending is ALWAYS an issue, it's all about if you agree with where the money is going. There are a number of jobs that taxes go to that I feel are very underpaid. Government is not one of them. I wish the way tax distributions are determined was changed drastically.