All this talk of "data" is quickly feeling unmotivated without an ounce of cite.
To be sure, use of the terms "progressive" and "substantial" in context here is quite misleading at face value, and every time you handwave this federal receipts as a percentage of GDP metric as if it somehow magically supports an argument that the wealthy are paying their equitable and sustainable share, it comes off even more as disingenuous.
We need only disaggregate this total metric and recognize a long declining trend in tax receipts on corporate income as a percentage of GDP[1] to see how such an argument falls flat on its face.
Furthermore, we can see from the CBO report previously cited[2] that at the individual income level, the largest gap in tax liabilities by a massive margin is from underreporting of business income, i.e. flow-through from partnerships, S corps, estates and trusts, rent and royalty, farm, and nonfarm proprietor income...and that doesn't even account for the sophisticated evasion that's happening right under our noses as previously mentioned.
So if total receipts remain flat (as you point out) while receipts attributable to corporate income are clearly on a declining trend, it begs the question: who/what has been shouldering the implied delta?
It should come as no surprise that corporate profits after tax is strongly correlated to public debt as a percentage of GDP[3], of course, with a grift catalyst that comes along every few decades that allows the cart to lead the horse for truly outsized profits before the inevitable reversion to the mean expensed by even more public debt.
It should also be unsurprising that when public debt to receipts ratio[4] is levered over 6x with interest rates as high as they are (never mind the $82+ billion and snowballing negative carry by the Fed[5]), negative sentiment brews as private wealth locks in exit liquidity while the rest of the public braces to "socialize losses" in the long run.
[1] https://fred.stlouisfed.org/graph/?g=17rUd
[2] https://www.cbo.gov/publication/56467#_idTextAnchor018
[3] https://fred.stlouisfed.org/graph/?g=17s68
[4] https://fred.stlouisfed.org/graph/?g=17saE
[5] https://fred.stlouisfed.org/series/RESPPLLOPNWW