Many of the arguments around this seem to assume that if someone is going to inherit, then they must automatically be significantly advantaged compared to everyone else, bit that just isn't true from what I see around me.
The IFS did a paper on this before the election, where they found that those inheritors who would benefit from the change are disproportionately at the top of the income distribution.
Last year, the estates of 35,000 were subject to inheritance tax; around 5% of the total. In the years ahead, 90% of estates will still pay no inheritance tax.
The IFS was negative about the proposal, saying it had the potential to distort savings behaviour and work incentives in an undesirable way.
They also quoted leaked Treasury analysis that advised: “there are not strong economic arguments for introducing an inheritance tax exemption specifically related to main residences”. The document lists a number of problems with the policy for example the fact that it would encourage investment in owner-occupied housing rather than other more productive investments and discourage downsizing late in life when that might otherwise be appropriate.
(Last bit lifted directly from the IFS paper).
Honestly, if people are in the position to be inheriting from one of the tiny percentage of estates that are subject to inheritance tax, they are privileged.