Her advice fails to accept the reality of social and emotional needs. It also fails to address the (sometimes severe) downside of non-conformance. This advice made me an Outsider whether or not I wanted to be. I now believe that these were tools she formed to get her through her own family and social trauma, which she falsely assumed would be generally useful, and did her best to arm her children with her best tools. I also believe there are upsides to the approach, but the trade-offs are real and cannot and shouldn't be swept under the rug. I imagine others had similar experiences with religious parents.
Advice is dangerous. It has built in moral hazard. Advice is too often given in well-meaning ignorance and pride - but ultimately advice gets someone else to test your hypothesis for you. So if you've not gotten any life-changing advice, be glad!