After all, compared to steel helmets, leather caps obviously hold an advantage in everyday warmth because the raw materials are self-sufficient and inexpensive. But the bigger reason is— these countries greatly underestimated the importance of defensive capabilities.
This world had not yet experienced a massive and brutal war on the scale of the First World War, so there was no theory to support the idea that generals would make up their minds to popularize steel helmets or similar protective gear.
Not everyone had a system like Tang Mo, with the ability to accurately anticipate the future. Therefore, some countries simply copied the homework of the Great Tang Group and directly purchased steel helmets, while other countries did not do so for various reasons.
Some did it to save money, others did it to save money, and still others simply did it to save money— one reason was enough, no second was needed.
