One thing to note about "big companies" is that everyone involved at the upper levels are rich enough to engage in recreational lawsuits. So if you say anything true about their performance, you get hit with a defamation lawsuit, possibly in a speech-hostile venue like England. The end result is a conspiracy where it's in everyone's best interest to lie about their peer's performance.

These are "APE[0] hires". Their goal is not to build a better company, their goal is to trade favors and power around a select set of elites brought together by a mutual hatred of the rest of us. You hire an APE for the same reason why royal families used to marry their daughters off - it's a way to trade power. "Worked at big companies" is a code-word for "has enough clout to play with the other lizard people in the room".

[0] Assimilation, Poverty & Exclusion; the opposite of a "DEI hire"