In TOS, artifical intelligence, androids, robots, advanced computers, are almost always seen as a mechanical menace, that can not be trusted, and must either be subdued or destroyed. Examples include Landru, Nomad, the Doomsday Machine, the M5 computer, and various androids.

Compare that to TNG and onwards, where artificial intelligences are usually seen as artificial life, deserving of respect and a right to exist. Examples are Data, the Doctor, the Exocomps, and Wesley’s nanites.
The Moriarty hologram, after taking the entire ship hostage, was allowed to continue living in a sandboxed computer core. Picard was even aghast at the suggestion of wiping out the entire Borg Collective with a virus, and that was after he was assimilated.

I am sure that if the episode of TNG, where Data takes command of the USS Sutherland, was set in TOS, the episode would have been about not being fit to command a starship.