I tried out the experimental mod in the sandbox a few times. In my view, the bonuses and penalties look good; you can use them to offset negative effects and, on paper, end up with no negative modifiers for your doctrine. Or you can make a trade-off, sacrificing one thing for another. You can apply this to specific units to boost their strengths.
However, there are still a couple of points that left me a bit puzzled.
In any case, the available cards sometimes force you to choose a card with better stats rather than one that aligns with a specific doctrine.
For example, you might get a legendary card that boosts turret damage and range, and it would be far more powerful than a card tied to your chosen doctrine (such as one for ground forces).
I’m not sure what form this mod was originally intended to take. However, I think it would be great to somehow encourage the player to focus on a specific playstyle, even if it isn't the most profitable option at the moment compared to others.
For instance, there could be a counter tracking selected cards of a specific type, along with a bonus that scales based on that counter. That way, I’d be inclined to stick to one—or perhaps a few—specific doctrines, even if another doctrine offered a stronger base bonus. As an alternative, the counters could even be tied to specific card classes.
