The whole reason Japan is even relevant in the first place is due to western technology. Prior to that it was just some island far away stuck doing little for basically 2000 years. Having a large sea affects everything. Western tech allowed them to bypass a lot of restrictions. It even gave islands like UK and Japan immense power due to the navy meta at the time.
But that tech is a double edged sword. America bombed it without any issue because that sea is no longer a barrier. Likewise China can do the same.
While we look to the past for lessons, we have to recognize things change and may not be applicable today. Mongols had a huge advantage being on the steppes where they could just run away on horses whenever things got tough. With western tech today however, those guys are just sitting ducks used for target practice from either aircraft, missiles or tanks.
But that tech is a double edged sword. America bombed it without any issue because that sea is no longer a barrier. Likewise China can do the same.
While we look to the past for lessons, we have to recognize things change and may not be applicable today. Mongols had a huge advantage being on the steppes where they could just run away on horses whenever things got tough. With western tech today however, those guys are just sitting ducks used for target practice from either aircraft, missiles or tanks.