Not sure I agree with you. There is a huge amount of people that don't have £1000 to their name so how many do you think have over £325K in cash and investments? Not many for sure.
Just look at house prices in the south east and other hot spots,. Plenty of property well over £325k, and in many cases over a million. People who worked hard to own their home should be able to pass it on to their kids.
People are getting wealthier, that number will shoot up. Income tax is a fairer way of sharing the burdenAnd remember only about 5% of estates pay any IHT.
A lot more could have been done to save those homes for the nation. But post war income tax was in the 90 per cent plus range, basic rate the 30 per cent plus. That funded public infrastructure like hospitals and social housing. Low tax means low investment.When death duties were a "thing" countless country homes fell in to ruin until they got passed to the National Trust - some get sold on and typically to foreign investors who rarely live here.
I'm not knocking the royals, King C pays voluntary income tax.In the case of the Royals - they can't sell anything and if you look at the Ducky of Cornwall - its sole purpose is to provide for the Heir to the throne AND also it employs a vast number of people and they pay tax and NI etc etc