Tax reform isn’t about the stock market not is it the judge of its success or failure.
It was pitched back in 2017 as having a positive effect on the market.
But we don't need to see a lower market to judge its failures; we can simply look at the unfulfilled promises made of it to judge it a failure:
You all promised wages would grow $4,000-$9,000
You all promised it would "pay for itself"
You all promised it would spur investment and expansion
You all promised it would repatriate tax revenues
You all promised it would stop outsourcing and offshoring
You were wrong about all of it.
The only metric of success is how much it grew the deficit and debt, which you judge as a success because it gives you the justification you seek to cut the spending to which you are ideologically opposed, but lack the courage, will, and support to repeal through conventional legislation.
Tax cuts are
fiscal terrorism, and you are their terrorist apologist.