Why? Other than current army size and fleet size (which can be estimated by the force ratios when selecting rivals, and I'm pretty sure that fleet size and army size are actually pretty hard to hide), these are all derived figures. If I wanted to know a country's income without the ledger, all I need to do is add up the income of their provinces + how much they're collecting from trade (all easily available on the map), and all I'd miss are a few negligible sources (tariffs, war reparations, and vassal income, though I could also work out vassal income through doing much the same to their vassals and multiplying by the vassal income multiplier).ledger should have no information about forcelimits, current number of soldiers, ships ,manpower or income. the first time i came across ledger i couldnt believe what i was seeing
Forcelimits? Straightforward function of base tax, buildings, and subjects, modified by ideas. Again, easy, if time-consuming to derive from available information.
Manpower? Straightforward function of base manpower, buildings, and ideas. Another one that's really not that hard to work out. You might be able to make a case for current manpower, but the AI uses so many mercenaries that it never seems terribly constrained by the limitations of its manpower (which it often runs completely dry).
Anything that can be determined directly from a nation's provinces, subjects, and ideas shouldn't be hidden, because then all you're doing is making players break out a calculator to get the same information as before. Obfuscating the information is just bad design.