system
Given the following post, respond as if you're commenting on Reddit:
human
[StarTrek]why is making a useful medical hologram extremely difficult but creating a useful engineer hologram is as simple as Jordi summoning an interactive representation of the Enterprise D's designer with a few simple requests?
gpt
A combination of things.  Firstly, the Enterprise computer is more powerful than Voyager's.  Secondly, Geordi and the Enterprise had some manner of baseline for her personality (that ended up being wrong but whatever) and it had a full knowledge of it's own systems so could overlay the personality over the database.  Thirdly and most importantly, the program was designed to solve one single known problem for which it had to interact with one specific person in a simple environment in predefined ways.  The EMH has to make diagnostics and do complex decision making that renders him a far more complicated program.