What this reminds me of is those parents who say, I won’t teach my children any religion, then when they grow up, they can choose their own.
Would we say such a thing about language? “No language for my children, they can choose their own when they are adults”? Of course not, and it would ruin their development if we did: there are certain times when children can learn certain aspects of language, and if they don’t learn it at the right age, they will have trouble with it for their entire lives, for the most part.
I actually knew a deaf adult who had been taught, as they did at the time, orally, where he did not learn sign language but only.lip-reading and speaking. If you asked him a question, like when shall we meet? He might answer with the place to meet.
This makes me wonder about children who are not taught certain things at certain ages, like delayed gratification.