The point of @Kovax was about "Really poor equipment for ground troops."
We didnt comparison about navy, we was talking of tanks and infantry equipments.
Tanks dont navigate on sea, and ships cant invade territory. Than is not possible compensate one each other.
Japan didnt fight only on the coast and islands, they invaded millions of square Kms of enermy continental lands, and they didnt it with navy or air force.
The Crappy Japanese tanks were compensated by a First-Class Naval Fleet, which was till 1942 the No:1 or No:2 in the World and backed by a relatively strong air-force.
Also, the average Japanese infantry-man was ready to die for the Emperor with a zeal unmatched by any other nation. This did result in a lot of wastage but also gave the Japanese divisions immense morale, the "Italian type mass surrenders" did not happen to the Japanese.
Again, the "Terrain and Geography" of the Japanese war was mainly- Jungles, Hills, Islands etc which required good Air-Sea power backed by strong infantry, tanks were not very good in that terrain unlike in North Africa where the Tanks reigned supreme. After the steppes of Southern Russia, the North African theatre was perhaps the BEST tank country and missing this concept hurt Italy badly.
That is what i wrote.
The Japanese invaded because they thought their Navy would keep the Sea-Lanes open and their Air-Force will neutralise the Allied Naval and Air-Power. A very important assumption which failed in the end, but for the first one year or so it did succeed.
Why the Navy? Both Japan and Italy were dependent on Imports, Japan even more so on trade routes but Italy also was vulnerable.
There is a difference between "all round weak" and "weak in some areas and strong in others".
The Japanese Infantry did quite well with their limited equipment in the "Terrain they were supposed to fight in", if you actually observe their OOBs, the Japanese conquests were pulled off with less than 10 divisions (including the SNLF, Paras and other specialists) and most of the Japanese army was facing China from 1937-1945.
Against China, the Japanese equipment was sufficient to win.
Tanks will not make a decisive improvement in combat in areas like - Solomon Islands, Guadacanal, Malaya, Singapore, Burma etc but a huge difference in Libya and Egypt.
To support my claims, i present-
1. Terrain Map of South-East Asia - - https://commons.wikimedia.org/wiki/File:South_east_asia_topographic_map.svg
and
2. Terrain Map of North Africa - http://www.geo.utep.edu/faculty_staff/harder_files/nafr/nafrtop.html
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