Just passing by here buddy, I'm just openly spitballing okay? Ok.
Look at things in perspectives, the world is a changing where there is a growing trend of loss in traditionalism and culture where the values of family and togetherness is utmost expressed. Globalisation, migration, technology and society, these aspects are the catalyst for change within morals and ethics that resonate within an environment where there is relevance i.e. family and relations. Suggested by your post, you deem the amalgamation of professionalism and issues as inoperable. However, what does it hold today you may ask? The retention of customary beliefs and morals is reinforced by family and in this instance, Sir Truong himself. I ask this, where does this development occur in a society where change is rampant and technology overrides the nature of past comings? His teachings through this tact heighten the needs for these to exist for we conform to insurmountable change that occurs endlessly around us. Overprotection clouting judgement? Your post again suggests negativity in turn with asking for issues/advice, in many instances it can be advantageous or enlightening as there is the staff who are students, in workforce as well the man himself which can provide advice in relation to x, y and z. It's also a resource available to allow the prospects of growth.
Your post is also incoherent in the interpretation of the atmosphere as a cult/sect. Is there secrecy. Can one's expression of undescribable debt be shown without opinion? He has done many things for many people, thus the relations each person holds on that string where it intertwines on both ends. It's a personal agenda where those people are able to connect with emotionally or through examples of situations.
Also, your nature of displaying places of tutoring as workplaces and professionalism is incorrect. In your belief that businesses are required to be professional, businesses must be in tune to the employees and customers wants/needs so is that being unprofessional? Furthermore, there is a required togetherness is businesses where they express a family structure, whereas in this situation, it's built upon family, morals and ethics to live a life where you are not tainted by negative impacts.
My 2 cents.
Edit: If you don't believe the loss in tradition take into instance varying cultures
1. Migration by war -> Asians, Europeans, Middle Easterns
2. Instability in environment
3. Want for wellbeing for children ; catch-22 in today's society seeing that there was unaccounted for change in the past few decades where life has been revolutionalised by war, technology, money, greed, globalisation. Clout of morals (Refer to latter); does that cloud judgement by overprotection, maybe in instances of parents, but moving on...
3. Jews ; diaspora
4. Fads and society's "pre-requisites to being accepted" ; loss in culture/tradition/ethics/morals
i.e. the rare number who believe in Hollywood life, the ghettos, g's, drugs, being high, XxxDragonImmoralxxxX, A$$YRIANKINGZ, gh3tt0_g, etc