First all the TD-H8 are the same, they are just running different firmware modes. You can change this mode by holding PTT plus either Asterisk (Ham), Zero (GMRS), or pound (fully unlocked) as you turn on the radio.
If you fully unlock it it defaults to medium power being 5 watts and high power being 10 watts on GMRS frequencies
Even in GMRS mode though, the power configuration app can indeed be used to change it to 10 watts.
We aren't debating anything, we are passing on information on how different radios work. Why comment if you have nothing useful to add?