I think Micahel is too skeptical of non-surgical methods.  Weightlifting for example is far more effective than any surgical method to increase muscle(that I know) and CRIPSR technology to inhibit myostatin.  And weightlifting has life extension benefits over potential surgical technology.  As catabolism(fasting, temperature exposure, exercise) all increase life via autophogy and surgery once in a while cannot currently do that.  A regular way of stimulating longitudinal bone growth will have an exercise benefit over surgery and could lead to life extension.  Any form of marrow stimulation will potential have strong health benefits.

Also, I think Michael is too negative in regards to potential surgical/advanced methods of height increase.  Scientific progress is very inefficient.  I don’t think there’s anyone who’s saying that the way science is conducted is optimal.  It’s ultimately capitalism rewards people for doing the least amount of work for the most money.  And science has tons of failures which makes it more profitable to go into something with more guaranteed success like computers.  If science were done optimally then I think it would be more fair to criticize the snail like advancement in a lot scientific fields.