It causes unnecessary problems unless there’s lots of money in the first place.
I have seen this go wrong so many times.
One woman, a great mother who worked hard to bring up her children and looked after her parents and grandfather as they became frail, was left almost destitute because she’d never earned enough to buy her own home. Her grandparents left money to this mother’s children and her own mother left her house to the grandchildren. It wasn’t that those people thought that the mother wouldn’t look after her children or wouldn’t leave what she had to them: they just were very sentimental about the grandchildren and didn’t think how the mother would manage. So she was overlooked by the people that meant most to her. That was hurtful and put her in difficulties.
Another case, the grandfather left a life interest in a house to his daughter with the grandchildren to inherit when she died. This became a massive inconvenience when she became old and frail and had to live with one of her children. There’s absolutely no way that she wouldn’t have left everything she had to her children. She adored them. There wasn’t a lot of money and everyone’s life would have been far simpler if she’d just inherited the house.
Another one, though a bit different: a reasonably well off couple, only asset a house, made lots of bequests to friends in their wills. They had little to do with their children because they moved away to their “dream retirement” in the countryside and weren’t interested in their children. Yes, the children visited but it was only ever one way: the parents didn’t want to visit in return: travel for holidays, yes, but to visit children; not interested. So their named new friends in the retirement area got generous bequests. When the widow became frail she had to go into a care home. Their children had to travel hundreds of miles to sort things out, which to their credit they did, despite their parents not having been much interested in them. The house was used in care home fees. The “close friends” did nothing when the widow became ill, nothing, not even visits. They got their bequests and the children got nothing.
I could go on. If you’ve got plenty of money then possibly, but otherwise it causes sadness and problems.