>>713421140
All of those are mechanics I'd like to see explored further, not removed.
There already are several occasions where you can and are even supposed to guess the login. Sometimes the code is as simple as 12, or 6512 for MJ12. Sometimes you get the password but not the username like in Everett's hideout, but it's easy to guess that his login is meverett. This can't be done if the game automatically fills in the credentials.
As for health, it's supposed to make you weigh the pros and cons of healing specific body parts. Do you want to restore movement speed by healing the legs or accuracy by healing the arms? Or maybe tank more damage by healing the head/torso? It's a pretty crude system but could be improved by making the penalties from losing limbs more meaningful.
The keyring is pretty useless but again, it could be improved. It lets you re-lock doors so you could add another gameplay mechanic there where you could lure and lock enemies into closed spaces and lock them in as another non-lethal way to get rid of them for example.
I want more and deeper mechanics, not streamlining.
