Pros/cons of borrowing cash against stock in IBKR?

It’s no secret that one of the main ways the wealthy avoid paying taxes is by borrowing against cash flow generating assets instead of selling those assets.

If I’m not mistaking, IBKR now allows retail investors to do this at rock-bottom interest rates: https://www.mrmoneymustache.com/2021/01/29/margin…

Doesn’t this make way more sense than keeping a huge pile of cash on hand in savings? Why not have that money working for you until you need it? And then even when you borrow against it, the assets are still working for you

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