arknights has more successfully captured what "a playable servant" would feel like than any official type-moon game so far, is the thing
servants have quantifiable stats but while those do play Some role in servant vs servant combat they're basically irrelevant once the noble phantasms come into play, because servants by definition all have at least one super special trick that breaks the established rules for what is possible to happen. battles in fate are not about running the numbers they are about strategic use of your special bullshit trick and exploiting loopholes in the opponent's special bullshit trick. it's alllll about finding and creating the conditions under which your special trick can break the rules the most.
fgo does not do this. the vast majority of fgo servants don't have a special trick at all, they have buffs and debuffs and damage. very rarely they make something that manipulates the mechanics directly a little like BB summer card lock but categorically they make each kit by simply checking some boxes on the list of things that can happen in the game. the extella games gave every servant's noble phantasm and abilities the exact same effect of "damage" with only the animations being different. the extra games did put a lot of emphasis on information over raw numbers so they got closest to capturing the nature of servant vs servant combat imo but they still didn't really dabble into manipulating what is game-mechanically possible to happen. they stick to the rules. they preserve "balance'.
but servants are not balanced. servants are completely defined by the fact that they each have their own unique gamebreaking trick. just like 6* operators.
6* operators have quantifiable stats. they do this or that type of damage. they have this or that amount of offensive and defensive numbers. but more importantly, they also all do some bullshit that redefines what is or is not allowed to happen on the field. and the bosses all have their own special bullshit tricks that control what happens on the field, and you win by exploiting the loopholes in those tricks with your own tricks. and sometimes that trick is in fact just overwhelming firepower. THAT'S servant on servant combat.













