As a HoH person using powerful hearing aids, I think the psychosocial consequences of NOT using the technology would have been far, far worse than USING the technology. I enjoy my social life with friends and family, enjoy concerts and ballet performances with beautiful music, enjoy church, enjoy walks on the beach listening to the waves and the caw, caw of seagulls. Most importantly, I enjoy easy communication with my husband. None of that would be possible without my hearing aids. (For ME - I realize people who use only ASL with friends and family can say the same thing about their own communication. I am not in that group, however.)
So there's at least "once" when technology was able to "remove the psychosocial issues connected to deafness."
I would guess that many of the participants here in AD who use hearing aids or CIs would feel much the same. I think you are way, way over-generalizing any negative effects of technology, and way, way minimizing the benefits so many of us have gained.
Just because you chose to raise your child without hearing aids and/or implants, and think he's better off for it, does not mean that people who make the other decision are wrong.
Calum's mom, I think you're doing fine. You're making an informed decision, you've got a Plan A that looks like it should meet his needs with appropriate teachers and an appropriate peer group for him that includes other deaf children, and you've got a back-up Plan B in mind that is also very reasonable and accessible to you.
When you hear criticism from certain people here, remember that they are heavily invested in being "right" because they made different choices than you did. Take it with a large grain of salt, and don't lose confidence in yourself.