The Scots and lot of other countries have decided to do it differently. What do they see as the advantage of this to their people ?

Isn't it fairly easy to arrange that nothing goes to children? Get equity release on the assets, take out an annuity to keep you comfy till you die and give the rest to the cats home now. That should mainly involve of-the-shelf services from the lawyers and keep things simple for your executors and anyone to whome you give enduring power of attorny in case you body lasts longer that your brain.