So what, it doesn't change a thing. The person dies, now other people, not him, receive money that they did not work for, in the order of millions, which completely changes equal the rules of an equal opportunity system, transfers social mobility without merit, advantages a person over everyone else based on luck, not merit, and creates huge inequalities that are again, not based in merit. It's the opposite of the American dream, that social mobility is gained by working hard, instead it happens to be mostly inherited and those unequal inheritances create barriers for everyone else's social mobility.
That's why it ought to be limited more than it is now.
For example, the estate tax in 2001 was less than $700k exempted, above that you paid 55%. So you could get more than half a million tax free, and if you got say 5 million more, you'd keep another 2.5 million. It's still a gigantic advantage over everyone else to inherit $675k tax free, and half of anything above that. (I inherited money myself, and it's ludicrous).
By 2008 the figure shot up to $2m exempt from taxes, and the tax rate above that dropped to 45%.
And then a weird thing happened, it went to $5m by 2011 and the rate dropped further, to 35%. Today it's beyond even that, and it's starting to get insane.
Now look at what that means. Imagine inheriting $5m and putting it towards stocks, which have a long term average ROI of 7%, already inflation adjusted. You'd get an annual salary of $350k, taxed low by the way because top capital gains tax rates are much lower than top tax rates on labor.
Imagine 'receiving' a ticket for a lifetime (inflation-adjusting & compounding) $350k income-per-year like that from someone else who actually worked for it (or guess what, inherited it himself), would you ever have to work? Would you have a difficult time increasing that money while spending $100k on yourself per year, without working? Would you be able to give away more money at the end of your life than you received, without ever working? Would receiving this financial claim over other people's future work (a definition of money) based on blood right be akin to medieval nepotism? Would this create a system not just with unequal outcomes, but with inequality by design? The answer to all these questions is yes.
Which is why it's time to consider reforming estate tax. I'm sympathetic to receiving and giving part of your wealth to others without the government stepping in. And we can keep that to large amounts, like say $100k. But there have to be limits, and the limit of $5.5m and just a 40% tax above that like we have today, is way too high.