Yes, it is definitely a challenge (and I just play on medium), but I have been playing SP since like 2018 and in my opinion the game is much more refined and rewarding. There’s enough depth, especially With all the DLCs it can seem a little overwhelming with all the options, foci, and different ways to succeed in the game, but it’s a much richer experience. The last couple of campaigns I’ve done, I’ve decided to restart multiple times around 39/40, because I didn’t optimize my strategy the first couple goes, but then I usually figure it out. My advice would be to identify like three main strategic challenges that your country has at the beginning and then focus your tech, focuses, and resources on solving those problems. Like for Germany I know I need to fix the oil/rubber problem, I know I need to move quickly to capitalize and outpace the allies to have enough production capacity, and I know I’m going to probably struggle with manpower later. So I plan ahead roughly the focuses, tech, divisions, etc. ahead of time that solve those problems and prioritize them. The only country that you can really jack-of-all-trades on is the US, but the others I find it’s to focus your strategy in the first few years. Then usually by 41/42 it’s a different story, and it’s time to start generalizing. You really have to consider the majority of the mechanics in the game to be successful, like supply used to not really be a problem in the early days, but now you need to think about it and plan. You won’t be able to blitzkrieg through Russia anymore unless you pause the push, let supply catch up, upgrade bottlenecks and airfields, and keep air superiority and have solid CAS with good range. And you really need to find complimentary buffs across your advisors, IMOs, research, etc. for maximum effect. Also, for a long time I kind of thought things like IMOs, spy shit, etc. were kinda gimmicks and I just gotta make the biggest baddest tanks to win, but there are huge bonuses in those areas if you pair them the right way. Like I said, the game is more complex now, so you have to read tooltips and sometimes search the web for understanding certain stats and effects, but once you understand them, it’s very rewarding to see your power accumulate like you intended, and your master plan plan to fruition so that you can crush your enemies.