True, and that's sort of one of the biggest wars in the Net Gain design schema. that balance between detail vs. everything else that too much detail can mess up (e.g. intuitive controls, accessible data, "pin in haystack" kinda stuff... plus the strain on processing and memory and savegame size and loading, etc).
One of the guidelines that helps control that limit is: the net gain rules are to remain compatible with the tabletop rules, so it must maintain at least that level of detail. But, keep in mind, this is a game of brokers, so just as you only have so many stats for your weapons in DnD, you only have so many stats for your operatives in NG. Operatives are the game's main interaction point, so they'll always be very complex, but they must maintain a scope where one player at the table will be able to keep that operative in mind without forgetting everything else.
The US military has this "rule of 7" where you're supposed to have up to 7 direct subordinates, and any more than that is a detriment to your attention and ability. There's flexibility within this attention budget by having some operatives that you just sorta set up once then stick on a task until you're bothered to look again, who don't take up too much attention, and your main ops running that mission you're really invested in, and those semi-important side ones can just have the leader op who you only need to worry about when he calls you to check in, report emergency, etc.
Of course this is all mechanics related. once these are laid down, then if I can keep this thing running, I can go back and fill in the "aesthetic details" such as resumes, more amusing interactions between ops, or the broker. more trait tie-ins to various simulation "cogs", like giving the operatives vacation time, having traits decide what they do on that vacation, if things happen while they're out, etc etc. things that aren't so much impacting gameplay if they're worked into an existing system (say, a broad "recovery time" mechanic for operatives, and a vacation is how they recover Integrity and Personality, maybe some Acuity burn damage, etc.). so then it's just part of this "heal this operative" command, but the detail that command pulls forth is rich.
That kinda stuff will require some time, right now I'm focusing on some of the broader strokes.