>Why couldn’t this happen before?
That's exactly what happened before.
During the Nixon recession, leading up to the wage & price freeze.
And after the freeze was lifted, the financial power imbalance was no different so inflation went even wilder due to pent-up un-fulfilled greed among the financial leaders whom had to do without growth for a little while there.
Even though the value of the dollar was declining due to destabilization, there were less available for the majority of workers/taxpayers, but financialists still needed more of them or the math would have made them look like their greed had failed like never before. They are rewarded on greed numerically in ways that everyone else can not compare.
The freeze worked to cement the imbalance leading to the exaggerated wealth inequality we have now.
The more apparent income inequality today is minor by comparison, but they were both locked in like never before mainly by pure unchecked greed.
Freezing prices didn't help much, but freezing wages even for a little bit was completely counterproductive by setting the workers/taxpayers back many more years by comparison to capital.
Those years have grown to generations now.