Photography is poor for three generations, and SLR destroys life. What does this sentence mean?

Photography lovers, the investment in photography is great. After all, digital products are changing rapidly. I just bought an accessory, and a new generation of digital products will appear in a few months. Especially those enthusiasts, have invested more in this area, so they say that "photography is poor for three generations, and SLR destroys life." The phrase "our family can gain more meat" means that our life is very good because we don't use these digital products or have low requirements for them. At the same time, children are encouraged not to pursue these things too much.