I’m glad this worked for you, but would your thought be to use unique signs for each kid if each had a multi-month signing phase?
In particular, I would not use this approach too extensively if your kid may want to be able to communicate with others who work with kids—teachers at daycare, speech pathologists, many nannies, other pediatric medical professionals etc. I do agree that straight ASL isn’t quite right either. Our kid’s speech pathologist uses a lot of signs but chooses for example to use “car”—a fairly easy sign—for all vehicles since bus, train, etc. are more abstract or complex. This approach has allowed our kid to communicate with a range of people over the relevant time period, not just our household.
For the results of a different survey, 10 years ago, asking similar questions: https://reason.com/2014/08/20/helicopter-parenting-run-amok-most-ameri
Nearly half of respondents think it should be illegal for a 12 year old to play solo at a park. It’s over 2⁄3 for a 9 year old. Those are tough numbers.