Oh, people (depending on specific circumstances) were better off for sure. It's not for the reasons they think though. I would bet where most people got the biggest benefit wasn't from their own tax return or a bonus but because of the stock market gains they had. And yes, the 17-19 stock market gains were largely due to TCJA...
If you have 100,000 in a 401k, the average person probably saw 60K of earnings from 17-19, a large percentage was due to TCJA. If you had a 100K of income, you probably saved a few hundred dollars on average per year. That's what I was trying to say.