My oldest is getting married and is having a time coming up with a registry (a nice problem to have lol). They’ve lived together for a couple years, and taken a lot of handmedowns, so pretty much have what they need to keep house. Instead she’s asking for upgrades versus brand new items - better luggage, nicer dishes without chips, etc. I don’t know if she will do the fund thing, that’s up to her.
My niece and her husband, who bought a house shortly before they got married, had Home Depot gift cards on their registry as the house was quite the fixer-upper. I’ve enjoyed seeing the renovations they’ve done.