I can actually defend, in-universe, the decisions about Data's chip going from fused to turn offable to removeable.
About two years pass between each film, except the last two films... that's about 4 years. We saw each character have a lot happen in just one year. I think as Data and Geordi looked at and tinkered in his head, they were able to gradually do exactly what was said in FIRST CONTACT and INSURRECTION... turn off, and remove.
I'm not really a fan of the emotion chip's apparent discontinuity, but I can understand it being a story told between films, off screen.
About two years pass between each film, except the last two films... that's about 4 years. We saw each character have a lot happen in just one year. I think as Data and Geordi looked at and tinkered in his head, they were able to gradually do exactly what was said in FIRST CONTACT and INSURRECTION... turn off, and remove.
I'm not really a fan of the emotion chip's apparent discontinuity, but I can understand it being a story told between films, off screen.