The Romulans used his neural pathways against him, but Tolian Soren used the Visor itself. He either hacked into it, or more likely successfully hid some kind of recording device & transmitter in it (Because what the Duras sisters saw wasn't Geordi's actual visual feed)
Which basically means Troi's hairdo would have been an equally severe threat to the ship's security...
the damn things were a pain & inconvenience that an integrated component wouldn't be
Was there any indication that the more compact tech would remove the pain? In "Farpoint", the problem was that he "uses his natural sensors in different ways". Which is obvious, as somehow the VISOR bypasses not just his useless eyes but also his useless optical nerves.
Either he is in pain for effectively having to watch through his ears or toes (or wherever those sockets on his temples ultimately lead in his brain), or then he is in pain because his eyes do weird things when he watches without them. A different VISOR or implant or even the installation of replicated real eyes wouldn't alter that - only Pulaski's nerve regeneration tech would.
Timo Saloniemi