The license they make you take is all fundamentals... There are hundreds of books and YouTube channels on the topic.

Isn't Amazon running on razor thin margins?

That cashflow has to come from somewhere.

His wealth is paper money. Paying them more would require giving up ownership of the company.

    Revenue                     $469.822 billion (2021)
    Operating income            $24.879 billion (2021)
    Net income                  $33.364 billion (2021)
    Number of employees U.S.:   950,000 (June 2021)
    
    (($33.364 billion (US dollars))/(950000 people))/(12 months)

    $2927 per month per person (US dollars per month per person)
    $96.22 per day per person (US dollars per day per person)
    $673.5 per week per person (US dollars per week per person)

Can you define your understanding of the term 'razor thin margins'?

Amazon is making record profits and is able to deliver tons of money annually to shareholders and Bezos, so I don’t buy that there’s a cashflow problem here.

Why does the "old monolith" need to be broken up?

I'm all for ending old software when the time comes but not everything needs a rewrite to microservices.

Supporting two development paradigms isn't really a thing any reasonably sized organisation should be concerned about.

Especially when you're talking about adding one more build process to hundreds across all your services.

It doesn't. You've loaded it up with omz.

You're making a lot of assumptions about people you know nothing about.

You're also making an assumption emcumbants are where they are because of their current merits and not the mere fact they're standing where someone stood before them.