The "No New Friends" mentality can serve as a healthy boundary for those protecting their peace and energy. However, it may also limit personal growth and new connections, reinforcing isolation and reducing the richness of diverse social experiences.
I agree, the “No New Friends” mindset helps protect mental space and energy, which is healthy. But it can also create barriers, limiting growth and fresh perspectives. Balancing boundaries with openness to new relationships enriches life and prevents loneliness.
In my opinion, the 'no new friend' mentality is a social limitation. It is important to make a friend everywhere one goes because no man is an island of himself. Your childhood friend may not be close by to offer help or even company when you need it.
It depends on your situation, if you are alone, it's a social limit, if you have many friends, it's a healthy limit, but as I say, it depends 100% on each particular case, it depends on your case 100%.