My initial point, though poorly expressed was ‘I think some information is necessary to enjoy the game, even if it doesn’t make a lot of sense’.
Specifically, I used infection as an example. Would a real-life person know that, failing to cauterize a wound twice, they are instantly infected? No, but the player needs that information and so it gets relayed.
I also mentioned weight and volume. Yes, can you approximate those things in real life? Sure. Do you? No. And don’t pretend that you do. Go to your bedside table and say ‘this occupies 2.5 liters of space’. o_o
But that information is necessary for gameplay reasons. This line of thinking extends to things like knowing item durability or limb health. Would you have a vague idea? Sure, but we need to quantify that in some way for the ease of the player. This applies to radiation, as well, in my opinion.
Radiation is ‘more hidden’ than a lot of information in the game, and I think it needs to be relayed to the player in some capacity, at some point. Yeah, it would be more immersive to always require a radiation badge or whatever to get that information, but this will also lead to ‘feelsbad’ moments for players that don’t understand what is happening. I think it’s easy for some of us to forget that we know more about the game than the average joe. For a new player, dying or becoming sick due to radiation without being aware of it at all would be immensely frustrating.
TLDR: It needs to be a balance between relaying pertinent information and immersion. You can’t have all of one and none of the other. Just my opinion.