I think most people would like society to operate on merit and be able to live a good life throughout, not hoping they might inherit a few quid when they’re in their 60s.
And of course - there is no guarantee anyone will inherit a lot of money. A lot of pensioner wealth is in their pension (which won’t be inherited in most cases), and properties may end up being used to pay for care home fees.
So - there is more to it than ‘oh well you’ll inherit some money’.