I think you're somewhat misrepresenting the math there.
If you are eligible to have both a pre-tax and post-tax retirement accounts, you should. As mentioned, you will be allowed to withdraw a certain amount from pre-tax accounts each year without incurring any taxes.
But also take into account state taxes. Where will you be retiring, does your state tax Roth withdraws, how much do you plan on spending in retirement, what's your tax situation now.
You answer those 5 questions and you'll get some decent answers here.
Since I was bored at work, I decided to run the calculations for different investment percentages in various increments between traditional and Roth. Like before, I assumed a $100,000 income, no state tax (sorry to you poor saps that live in states with a state income tax), and a desired take home pay of $64,861 after taxes and investing. Obviously, it's not the most mustachian lifestyle.
While 100% Roth was by far the worst option, I was surprised to see that 100% traditional was not the best option with those parameters. Instead, the best option out of those I tried came with around 70% of total amount invested going toward traditional. However, that option was only 0.2% better than 100% toward traditional.
I raised the gross income to $150,000 and the desired take home to $69,261 (gave a nice round 100% traditional contribution of 75,000) to see what changed. As the income rose, the ideal contribution rate
moved toward Roth a bit more. Now, the ideal contribution rate was around 60-65% traditional, 35-40% Roth did not change much (edited, since I forgot to adjust tax brackets as income went up.
In my next test, I kept that income but dropped retirement spending from $69,261 to $50,000. When doing that, the preferred split crept back towards 100% traditional, though not all the way.
It was still a very simplified calculation, but I took the following from it:
Your income and post-retirement spending dictate what is best for your situation. Without taking state taxes into account (boo), the best balance is usually somewhere inbetween, but leaning heavily toward traditional.