My last game as Germany, where I literally conquered every country on the map, I ended up with this breakdown:
'45 techs: 1
'44 techs: 3
'43 techs: 2
'42 techs: 1
'41 techs: 7
'40 techs: 0
'39 techs: 3
Looking at the other countries at the end of the game, they were in the same boat. Even when playing the US (which starts with 40 points to distribute compared to Germany's 30), it's really difficult to get more than 1 category to be '45 by 1945. From a gameplay perspective this probably isn't a huge deal because all the countries progress about the same, but it does limit the player's options on how to use this. Either the player has to spread the points across unit types they will want in the late game from the start in which case they'll have a few at the '43 and '44 level, or you specialize and shoot for hitting '45. So what this effectively does is cause the player to choose between breakthrough armor and heavy armor, and doesn't allow for having a mix of both in the late game. The same is true for infantry, aircraft, ships and subs.
I'm curious if this was intentional or not? I assumed it was because it means making some limiting choices, but when I looked at the later scenarios where the countries had levels that are simply unattainable using the current system, I'm not so sure.
I don't know the mechanics of how these progressions are calculated, but it looks like from 0 to about 12 days are randomly subtracted each turn for each point assigned. Very often you'll make no progress for a turn even with 2 points assigned. So it's really pretty random and you don't even roll the dice if you don't put at least 1 point in. To get to the '45 level by '45 you need to max the category, which means you have enough points to pick 6 categories to invest in, and it's pointless to invest even 1 point in the other categories.
If the intention was to advance to the levels of the later scenarios given the current mechanics, players would need a lot more points to distribute. Of course there are other ways to solve this as well, but that would probably be the easiest. If the point was to allow the player to advance one category at the expense of another, that's not really possible, as the top category is '45 and you can only attain that by maxing it out.
I'm curious if others are happy with this system, or if most people don't tweak these values at all? Now that I'm playing multi-player I'm thinking more about these system while waiting for my turn to come back.
