“I believe that it is likely that such parenting is THE root cause of MOST children going OTD.”
The problem goes way beyond parenting.
I would suggest the mere fact that we call it off THE derech is problematic as it assumes there is ONLY one derech. Accepting that there is only one derech often leads to ostracizing of the one who is not like the others. This then leads to to feelings of dissonance which will not always and perhaps not even often bring the one who does not fit in back to the fold.
Judaism is not black and white as many families/schools/people believe it to be. Yet we preach and “us” vs “them” mentality almost every day.
I’m certainly not making any suggestions to fix the siutation, but in my mind and as someone who is not a parent yet, I’d rather have a son/daughter who doesn’t necessarily follow every halacha to a T than one who does because their parents/community compelled them to do it and down the line inevitably rejects me as a parent and the community they grew up in as intolerant of those who do not fit the mold.