Well what would it actually do if you used it? Would it cause something insane to happen?
It would sail backwards?
If you want an actual WW2 game get HOI 3 instead, I'd even say Hoi2 DH over 4 but that one is probably too dated for someone who didn't play it as kid.
I'm not trying to be edgy on purpose but we're talking like fallout 2 -> 3 level decline from Hoi 3->4. The game is actually complete garbage.
Problem with Hoi3 is they killed tech team, and replaced them by "national leadership", which fucks minors.
HoI2 research had tech teams, where each tech team was proficient in different area. Thus poor countries like Africa countries, which are not simulated because WWII has only few countries because majority of them are listed as colonies which makes WWII less interesting than WWI games, or 1400 warfare where there was plethora of small countries. Tech team with skill 1 and expertise in certain areas was better than team with skill 1 and expertise in unrelated areas. And the kicker is Germany had teams with skill 8 and expertise in correct area. With tech team usable after annexing of a high tech country, a ComChi could get high end team with experience in ship building and aircraft manufacture.
HoI3 acts as every black and white are equal, there are no companies with long term experience in the field, which developed quite high tech, and all required is national leadership. The problem is it can't simulate a country with high research, but crap military leadership.
Another problem is WWII is quite unbalanced. Hobsbawn wrote about betting in US govenment, it was about when theirs president force Japanese into war. Japanese situation was completely fucked. They acted before war like complete morons and thought that US is free market, and as rule in free market they would sell for profit, and somehow didn't thought about consequence of losing scrap metal sales from US (for example when US would start do do something useful from that scrap). However US government wanted to screw Japanese, killing scrap metal exports to Japan, killing Japanese investments in US, killing Japanese oil imports, blocking Japanese assets in US. (Remember folks, never store your gold in US, it's bad idea. They have you by balls.)
As a consequence, US concentrated its effort against Europe, because even with 1/3 of effort Japanese would likely collapse on its own weight. Added with Japanese incompetence with ASW, and lack of transport ships, situation ended like UK would end when Donitz would get free hand with his plan. (But German HQ didn't want to overcommit into navy, and then lack land forces.)
Which causes problem with balance. The more you simulate the more Japan is hosed, thus better simulation starts to cause problems with game balance. Yea, they can add historical balance setting, for these who want to play bunch of cowards who are exaggerating danger, or win by a massive forces and massive loses even when they are completely oblivious to warfare.
Frankly, WWII game that tries too much to repeat history is worthy for about one playtrough. (It's not like HoI4 air interface wasn't designed by moneys for monkeys. But HoI3 managed to shoot itself into feet much more.)