Sometimes it’s a legal necessity! I have a child with severe disability and if they ever posses 10k in value they’ll be disqualified from their many thousands of dollars in mental health supports.

What we’ve done is set up things to go into a trust where their advocate can use money for ongoing support (my child is also extremely irresponsible with spending and used to always immediately spend Xmas gifts on impulse spending including a lot of scratch tickets). While their government support is great it may not always be there so the trust is there if there’s a break or support or to try and support them if they become disqualified from disability (it’d be fucking awful though, we’re well-ish off and our life savings could support our child’s support for about half a year max).