From what I remember, HoI4 originally didn’t even simulate fuel until a DLC added it in, fucking FUEL in a game about WW2, a conflict where access to oil was a major determining factor in strategy, like the Germans reorienting towards the Caucasus, and literally the reason for Japan declaring war on the Allies. And like, earlier HoI games did have fuel, so Paradox had just decided to not have this feature for some reason.

Although even with all of its simplifications, HoI4 still has a supply system, with infrastructure playing a role in how well a given region can be supplied, preventing you from just sticking all of your troops in one province, plus the new equipment system (previous games just had a general “supply” resource, plus industrial capacity that was spent on producing troops), where you have to actually make rifles and cannons and all the other stuff and equip your divisions with them, so it does simulate a decent amount of logistical stuff. The problem’s probably more so that the AI is too bad to really resist the player, so fucking up your logistics doesn’t screw you over as bad as it should.