I may be mistaken, but aren't there tooltips (small castle images) that indicate if you can move to a province or not? They are small and hard to see, so I noticed it only when I was at war with distant enemy and they appeared over FoW when I had a unit selected.
The fact it was possible to win by capturing provinces while enemy was away was just going around the rules, as no sane ruler will send every soldier available abroad. Or he would pull the fortress garrisons and levy what was possible to form an army, rather than sit back and wait as isolated castles fall one by one.
Better on what criteria? I prefer a game where you choice of where to locate your troops matters more often to one where it matters less often. I don't see any reason a different preference is inherently better, and from just what we've discussed so far there's more opportunity for skill variance when unit positioning matters more than less...something putting forts in obvious locations does not replace.
The fact it was possible to win by capturing provinces while enemy was away was just going around the rules, as no sane ruler will send every soldier available abroad. Or he would pull the fortress garrisons and levy what was possible to form an army, rather than sit back and wait as isolated castles fall one by one.