There are a few very wealthy people who will benefit from this, but more likely they have been able to plan for inheritance tax in a way the less wealthy cannot eg gifts during their lifetime and family trusts.
in reality is is a tax levied on home owners (who have managed to dodge care homes fees) in London and the south east.
Have a look at Rightmove and see which family houses cost between £1-2m in London. The people who live in these houses are the the current target of the tax. Remember, once the house price is over £2m the extra allowance is rapidly eaten away.
These are not particularly “posh” houses and a similar house elsewhere in the UK would be easily within the allowance.
My DM lives in such a house. It’s in E Dulwich (or what used to be called Peckham) and is a 1940s, terraced, 3 bed house. DM has Alzheimer’s, so it’s likely she will have to go to a home for several years in a few years. She wants her children to have her home - particularly the youngest, who didn’t manage to get on the property ladder.
currently, these houses are selling for £1.2-1.4m. DM (an ex nurse of 40+ years service) was never rich, but never poor and the house is “it” in assets, other than her pension.
How nice to know she’s “not most people” and is wealthy.