system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Cant our body just produce way more defenders so it can be ready in the case that it is ever attacked by a potentially life-threatening disease?

By defenders I mean, strengthening our immune system so it is practically unbeatable.
gpt
Well as a metaphor look at the vietnam war. Just having more dudes and material on your side doesn't guarantee that you win in the end.

The most critical part of the immune system is the coordination. Recognizing what is a pathogen and what isn't (false alarms are basically allergies, and potentially deadly). Also tailoring the answer to the pathogen in question. The general purpose part of your immune system is good to buy time, but the fight is won by specialists produced to fight exactly this threat.

If just producing more defenders would increase your chance of survival then your body would do that. Deseases have always been a major force in natural selection.