Hey, I'm not disagreeing with you here, but keep in mind none of those things are necessary for survival, and most such products can last decades if properly maintained.

I think you're arguing against the most extreme interpretation of what this person said.

To give you an example, I'll show you what it looks like if I were to interpret your comment in the same way:

In some capacity, you have to admit, self sufficiency is possible. Forged metal, magnets, and batteries aren't necessary to sanitize water, grow, forage or hunt food, or to build shelter.