I don't quite follow the math, but I'll assume you are correct for MFJ with 2 kids. I don't love what happens in the upper middle class brackets, but I could stomach it if it weren't for the deep cuts for the extremely wealthy. (Also, for that situation, turbotax or spending hours is not necessary under the current tax plan. Even itemizing is straightforward.) So, good deal for you maybe, but that doesn't make it a good plan.
Math:
Assume 90,000 income (to keep you in 12% bracket)
Minus 24,000 Standard deduction
Taxable 66,000 * 12%
Tax due 7,920
Apply child credit x 2 (3,200) + family credit x2 (600) for total tax credit of 3,800.
Credits 3,800
Tax due 4,120 (7,920-3,800)
or 4.57%
The way Business Insider calculates taxes on 175K income is a bit disingenuous. They assume average itemized deduction according to IRS (from all tax returns). Red flag. They should have used the average of that income band, not average of all income bands.
Also, what is really fair tax? What is an income level at which you should not have to pay any taxes in order to offset the "tax cut" folks with 200K income are getting? I don't see any proposal for a fairer system? In Europe, for example, counties implement flat tax on all income - 10% or 15% tax that applies to everyone. Is that fair? Or is it better to have our tax system, but exclude all income up to 100K for families and 50K for individuals from all taxes? Or should it be 120 for families? Where is the threshold for the tax system to be fair?
This is a very thorny question, but it is clear that the current system is not ideal. It is crazy to have to higher a consultant every year to figure out what taxes are owed. When I first started working, I pay way more tax than necessary due to not understanding the tax code and not having money to buy Turbotax. But folks that spend 400-500 dollars on tax accountants can save you 3K in taxes. Is that really fair? Is that really how a progressive tax system should work?