Going to sit for a bit…

A friend of a friend is going on a three year long retreat. There’s an interview with him here.

Three year long retreats, often solitary, are
traditional in Tibetan Buddhism, though the accommodation provided by Chinese retreat centres is sometimes lacking. The reason this guy came up in conversation was that apparently some people had objected to him doing it, regarding it as self-indulgent or similar -of no use to the world. Views?