People often forget these leetcode interviews guard the top wages in industry. If you remove them any bootcamp cowboy or people who can't code will get in and make same wage increasing competition among workers and pushing down wage.

Those who don't get selected keep complaining because other leetcoders are making high salaries while they don't.

Many want to install their wife in these companies and are actively complaining for diversity and putting it against interviews, so that once these requirements are relaxed for women, their household will double the income.

People job hop every year, so it's impossible to tell who has been fired for bad performance/inability to code vs high performer who is simply job hopping for increased pay/interesting project when hiring for your company. Also you can't get the performance data from their previous employer, you can only verify they worked there, nothing more.

Even if you simply cannot code, it takes a year least in big companies to fire you.

It's easy to fake portfolio and talk the programmer lingo than to walk the talk by coding.